diff --git a/README.md b/README.md
index cb94b8d..cd7bd92 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Awesome Math [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/sindresorhus/awesome)
+# Awesome Math [![Awesome](https://cdn.jsdelivr.net/gh/sindresorhus/awesome@d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/sindresorhus/awesome)
 
 A curated list of awesome mathematics resources.
 
@@ -76,7 +76,7 @@ A curated list of awesome mathematics resources.
 * [Khan Academy](https://www.khanacademy.org/math)
 * [Coursera](https://www.coursera.org/courses?query=mathematics&languages=en)
 * [MIT OpenCourseWare](http://ocw.mit.edu/courses/mathematics/)
-* [edX](https://www.edx.org/course/subject/math)
+* [edX](https://www.edx.org/learn/math)
 * [Brilliant](https://brilliant.org/courses/#math-foundational)
 * [WooTube](https://misterwootube.com/)
 * [Mathigon](https://mathigon.org/)
@@ -88,7 +88,7 @@ A curated list of awesome mathematics resources.
 
 ## Learn to Learn
 
-* [Understanding Mathematics](https://github.com/nelson-brochado/understanding-math)
+* [Understanding Mathematics](https://github.com/nbro/understanding-math)
 
 ## Youtube Series
 
@@ -119,12 +119,12 @@ A curated list of awesome mathematics resources.
 * [Wolfram Alpha](http://www.wolframalpha.com/)
 * [Maxima](https://maxima.sourceforge.io/)
 * [Sympy](https://www.sympy.org/)
-* [Sagemath](http://www.sagemath.org/)
-* [Unit Converter](https://unitconverters.net)
+* [Sagemath](https://www.sagemath.org/)
+* [Unit Converter](https://www.unitconverters.net/)
 * [GeoGebra](https://www.geogebra.org/?lang=en)
-* [Macaulay2](http://www2.macaulay2.com/Macaulay2/)
+* [Macaulay2](https://macaulay2.com/)
 * [Singular](https://www.singular.uni-kl.de/)
-* [GNU Octave](https://www.gnu.org/software/octave/)
+* [GNU Octave](https://octave.org/)
 * [Magma](http://magma.maths.usyd.edu.au/magma/)
 * [Maple](https://www.maplesoft.com/products/Maple/)
 * [Matlab](https://www.mathworks.com/products/matlab.html)
@@ -135,13 +135,13 @@ A curated list of awesome mathematics resources.
 
 ## Questions and Answers
 
-* [Mathematics Stack Exchange](http://math.stackexchange.com/)
-* [MathOverflow](http://mathoverflow.net/) - for professional mathematicians
+* [Mathematics Stack Exchange](https://math.stackexchange.com/)
+* [MathOverflow](https://mathoverflow.net/) - for professional mathematicians
 
 ## Encyclopedia
 
-* [Encyclopedia of Mathematics](https://www.encyclopediaofmath.org)
-* [Planetmath](http://planetmath.org/)
+* [Encyclopedia of Mathematics](https://encyclopediaofmath.org/wiki/Main_Page)
+* [Planetmath](https://planetmath.org/)
 * [ProofWiki](https://proofwiki.org/wiki/Main_Page)
 * [Wolfram Mathworld](http://mathworld.wolfram.com/)
 * [The On-Line Encyclopedia of Integer Sequences](https://oeis.org) - Great compendium of many different integer sequences. Founded 1964 by N. J. A. Sloane.
@@ -149,10 +149,10 @@ A curated list of awesome mathematics resources.
 ## Books
 
 * [Calculus: Basic Concepts for High Schools](https://archive.org/details/TarasovCalculus) - L.V. Tarasov
-* [Basics of Algebra, Topology, and Differential Calculus](http://www.cis.upenn.edu/~jean/math-basics.pdf) - Jean Gallier (University of Pennsylvania)
-* [Multivariable Calculus](http://people.math.gatech.edu/%7Ecain/notes/calculus.html) - G. Cain, J. Herod (Georgia Tech)
+* [Basics of Algebra, Topology, and Differential Calculus](https://www.cis.upenn.edu/~jean/math-deep.pdf) - Jean Gallier (University of Pennsylvania)
+* [Multivariable Calculus](https://cain.math.gatech.edu/notes/calculus.html) - G. Cain, J. Herod (Georgia Tech)
 * [Wikibooks](https://en.wikibooks.org/wiki/Wikibooks:Mathematics_bookshelf)
-* [Online Mathematics Textbooks](https://people.math.gatech.edu/~cain/textbooks/onlinebooks.html)
+* [Online Mathematics Textbooks](https://cain.math.gatech.edu/textbooks/onlinebooks.html)
 * [Beginning and Intermediate Algebra](http://www.wallace.ccfaculty.org/book/Beginning_and_Intermediate_Algebra.pdf)
 * [Free Mathematics Books](https://github.com/EbookFoundation/free-programming-books/blob/master/books/free-programming-books-subjects.md#mathematics)
 * [Trigonometry](http://www.mecmath.net/trig/trigbook.pdf)
@@ -178,11 +178,11 @@ A curated list of awesome mathematics resources.
 * [Areas of mathematics on Wikipedia](https://en.wikipedia.org/wiki/Areas_of_mathematics)
 * [Paul's Online Math Notes](http://tutorial.math.lamar.edu/) - Paul Dawkins (Lamar University)
 * [List of electronic textbooks](http://faculty.atu.edu/mfinan/nnotes.html) - Marcel B. Finan (Arkansas Tech University)
-* [Topology Atlas](http://at.yorku.ca/topology/)
-* [Recreations in Math](http://djm.cc/library/Recreations_in_Mathematics_Licks_edited.pdf) - H. E. Licks (1917)
-* [Magic Squares and Cubes](http://djm.cc/library/Magic_Squares_Cubes_Andrews_edited.pdf) - W. S. Andrews (1917)
+* [Topology Atlas](http://at.yorku.ca/index.html)
+* [Recreations in Math](https://djm.cc/library/Recreations_in_Mathematics_Licks_edited.pdf) - H. E. Licks (1917)
+* [Magic Squares and Cubes](https://djm.cc/library/Magic_Squares_Cubes_Andrews_edited.pdf) - W. S. Andrews (1917)
 * [Convex Optimization](https://web.stanford.edu/~boyd/cvxbook/) - Stephen Boyd and Lieven Vandenberghe
-* [Fabrice Baudoin's Notes](https://fabricebaudoin.wordpress.com/) - Both research and lecture notes on many topics, Including Diffusions on foliated manifold, Stochastic Calculus, Global analysis in Dirichlet spaces, and more.
+* [Fabrice Baudoin's Notes](https://fabricebaudoin.blog/) - Both research and lecture notes on many topics, Including Diffusions on foliated manifold, Stochastic Calculus, Global analysis in Dirichlet spaces, and more.
 
 # Lecture Notes
 
@@ -194,9 +194,9 @@ A curated list of awesome mathematics resources.
 ### Set Theory
 
 * [Sets, Relations, Functions](http://www.cosc.brocku.ca/~duentsch/papers/methprimer1.html) - Ivo Düntsch, Günther Gediga
-* [An Introduction to Set Theory](http://www.math.toronto.edu/weiss/set_theory.pdf) - William A. R. Weiss
+* [An Introduction to Set Theory](https://www.math.utoronto.ca/weiss/set_theory.pdf) - William A. R. Weiss
 * [Set Theory and Foundations of Mathematics](http://www.settheory.net/) - Sylvain Poirier
-* [Set Theory on the Stanford Encyclopedia of Philosophy](http://plato.stanford.edu/entries/set-theory/)
+* [Set Theory on the Stanford Encyclopedia of Philosophy](https://plato.stanford.edu/entries/set-theory/)
 
 ### Logic
 
@@ -212,7 +212,7 @@ A curated list of awesome mathematics resources.
 * [Proofs and Concepts: the fundamentals of abstract mathematics](http://people.uleth.ca/~dave.morris/books/proofs+concepts.html) - Joy Morris, Dave Morris
 * [Mathematical Reasoning: Writing and Proof](https://www.tedsundstrom.com/mathreasoning) - Ted Sundstrom
 * [Logic and Proof](http://leanprover.github.io/logic_and_proof/) -  Jeremy Avigad, Robert Y. Lewis, and Floris van Doorn
-* [QED - an interactive textbook](https://teorth.github.io/QED) - Terence Tao
+* [QED - an interactive textbook](https://teorth.github.io/QED/) - Terence Tao
 * [Open Logic Textbook](http://builds.openlogicproject.org/) - collaborative effort, main contributors listed [here](https://openlogicproject.org/people/)
 
 ### Category Theory
@@ -228,13 +228,13 @@ A curated list of awesome mathematics resources.
 * [Basic Concepts of Enriched Category Theory](http://www.tac.mta.ca/tac/reprints/articles/10/tr10abs.html) - G. M. Kelley
 * [Abstract and Concrete Categories: The Joy of Cats](http://www.tac.mta.ca/tac/reprints/articles/17/tr17abs.html) - Jiri Adamek, Horst Herrlich, George Strecker
 * [Seven Sketches in Compositionality: An Invitation to Applied Category Theory](http://math.mit.edu/~dspivak/teaching/sp18/7Sketches.pdf) - Brendan Fong and David I. Spivak (MIT)
-* [Category Theory in Context](http://www.math.jhu.edu/~eriehl/context/) - Emily Riehl (John Hopkins University)  
+* [Category Theory in Context](https://math.jhu.edu/~eriehl/context/) - Emily Riehl (John Hopkins University)  
 
 ### Type Theory
 * [Proofs and Types](http://www.paultaylor.eu/stable/prot.pdf) - Jean-Yves Girard
 * [Intuitionistic Type Theory](https://archive-pml.github.io/martin-lof/pdfs/Bibliopolis-Book-retypeset-1984.pdf) - Per Martin-Lof
 * [Type Theory and Functional Programming](https://www.cs.kent.ac.uk/people/staff/sjt/TTFP/) - Simon Thompson
-* [Programming in Martin-Lof’s Type Theory](http://www.cse.chalmers.se/research/group/logic/book/book.pdf) - Bengt Nordstrom, Kent Petersson, Jan M. Smith
+* [Programming in Martin-Lof’s Type Theory](https://www.cse.chalmers.se/research/group/logic/book/book.pdf) - Bengt Nordstrom, Kent Petersson, Jan M. Smith
 
 ### Homotopy Type Theory
 
@@ -242,14 +242,14 @@ A curated list of awesome mathematics resources.
 
 ### Surreal Numbers
 
-* [Surreal Numbers - How two ex-students turned on to pure mathematics and found total happiness](http://www.math.harvard.edu/~knill/teaching/mathe320_2015_fall/blog15/surreal1.pdf) - D. E. Knuth
+* [Surreal Numbers - How two ex-students turned on to pure mathematics and found total happiness](http://people.math.harvard.edu/~knill/teaching/mathe320_2015_fall/blog15/surreal1.pdf) - D. E. Knuth
 * [Surreal Numbers and Games](http://web.mit.edu/sp.268/www/2010/surreal.pdf)
 * [Conway names, the simplicity hierarchy and the surreal number tree](http://www.ohio.edu/people/ehrlich/ConwayNames.pdf) - Philip Ehrlich
 
 
 ## Number Theory
 
-* [Elementary Number Theory: Primes, Congruences, and Secrets](http://wstein.org/ent/ent.pdf) - William Stein
+* [Elementary Number Theory: Primes, Congruences, and Secrets](https://wstein.org/ent/ent.pdf) - William Stein
 * [Elementary Number Theory](http://math.utoledo.edu/~codenth/Spring_13/3200/ENT-books/Elementary_Number_Theory-Clark.pdf) - W. Edwin Clark (University of South Florida)
 * [A Course on Number Theory](http://www.maths.qmul.ac.uk/~pjc/notes/nt.pdf) - Peter J. Cameron
 * [A Computational Introduction to Number Theory and Algebra](http://shoup.net/ntb/ntb-v2.pdf) - Victor Shoup
@@ -261,26 +261,26 @@ A curated list of awesome mathematics resources.
 
 * [Introduction to Algebraic Number Theory](http://www1.spms.ntu.edu.sg/~frederique/ANT10.pdf)
 * [Introduction to Algebraic Number Theory](http://www1.spms.ntu.edu.sg/~frederique/ANT10.pdf) - F. Oggier
-* [Algebraic Number Theory](http://www.jmilne.org/math/CourseNotes/ANT.pdf) - J.S. Milne
+* [Algebraic Number Theory](https://www.jmilne.org/math/CourseNotes/ANT.pdf) - J.S. Milne
 * [Algebraic Number Theory Course Notes](http://people.math.gatech.edu/~mbaker/pdf/ANTBook.pdf) - Matthew Baker (Georgia Tech)
 * [A Course In Algebraic Number Theory](http://www.math.uiuc.edu/~r-ash/ANT.html) - Robert Ash
 
 ### Analytic Number Theory
 
 * [Introduction to Analytic Number Theory](http://www.math.uiuc.edu/~hildebr/ant/main.pdf) - A.J. Hildebrand (University of Illinois)
-* [Elements of Analytic Number Theory](http://math.nsc.ru/~vdovin/lectures/numth_eng.pdf) - P. S. Kolesnikov, E. P. Vdovin (Novosibirsk)
+* [Elements of Analytic Number Theory](https://math.nsc.ru/~vdovin/lectures/numth_eng.pdf) - P. S. Kolesnikov, E. P. Vdovin (Novosibirsk)
 * [Analytic Number Theory](http://www.mathematik.uni-muenchen.de/~forster/v/ann/annth_all.pdf) - Otto Forster (LMU Munich)
 * [Analytic Number Theory - Lecture Notes based on Davenport’s book](http://www2.math.uu.se/~astrombe/analtalt08/www_notes.pdf) - Andreas Strömbergsson
 
 
 ## Algebra
 
-* [A Course in Universal Algebra](http://www.math.uwaterloo.ca/~snburris/htdocs/ualg.html) - S. Burris, H.P. Sankappanavar
+* [A Course in Universal Algebra](https://www.math.uwaterloo.ca/~snburris/htdocs/ualg.html) - S. Burris, H.P. Sankappanavar
 * [A Course in Commutative Algebra](https://faculty.math.illinois.edu/~r-ash/ComAlg.html) - Robert Ash
-* [First Course in Algebra](http://djm.cc/library/First_Algebra_Hawkes_Luby_Touton_edited.pdf) - Herbert E. Hawkes, William A. Luby, Frank C. Touton (1910)
-* [Second Course in Algebra](http://djm.cc/library/Second_Algebra_Hawkes_Luby_Touton_edited.pdf) - Herbert E. Hawkes, William A. Luby, Frank C. Touton (1911)
-* [Algebra: An Elementary Text-Book, Part I](http://djm.cc/library/Algebra_Elementary_Text-Book_Part_I_Chrystal_edited.pdf) - G. Chrystal (1904)
-* [Algebra: An Elementary Text-Book, Part II](http://djm.cc/library/Algebra_Elementary_Text-Book_Part_II_Chrystal_edited02.pdf) - G. Chrystal (1900)
+* [First Course in Algebra](https://djm.cc/library/First_Algebra_Hawkes_Luby_Touton_edited.pdf) - Herbert E. Hawkes, William A. Luby, Frank C. Touton (1910)
+* [Second Course in Algebra](https://djm.cc/library/Second_Algebra_Hawkes_Luby_Touton_edited.pdf) - Herbert E. Hawkes, William A. Luby, Frank C. Touton (1911)
+* [Algebra: An Elementary Text-Book, Part I](https://djm.cc/library/Algebra_Elementary_Text-Book_Part_I_Chrystal_edited.pdf) - G. Chrystal (1904)
+* [Algebra: An Elementary Text-Book, Part II](https://djm.cc/library/Algebra_Elementary_Text-Book_Part_II_Chrystal_edited02.pdf) - G. Chrystal (1900)
 * [Understanding Algebra](https://jamesbrennan.org/algebra) - James W. Brennan
 
 ### Abstract Algebra
@@ -289,8 +289,8 @@ A curated list of awesome mathematics resources.
 * [Introduction to Modern Algebra](http://aleph0.clarku.edu/~djoyce/ma225/algebra.pdf) - David Joyce (Clark University)
 * [Algebraic Methods](http://www1.spms.ntu.edu.sg/~frederique/AA11.pdf) - F. Oggier
 * [Abstract Algebra : Theory and Applications](http://abstract.ups.edu/download/aata-20150812.pdf) - Thomas W. Judson, Robert A. Beezer (Austin State University)
-* [An Undergraduate Course in Abstract Algebra](http://www.maths.usyd.edu.au/u/bobh/UoS/rfwhole.pdf) - Robert Howlett
-* [Elements of Abstract and Linear Algebra](http://www.math.miami.edu/~ec/book) - E.H. Connell (University of Miami)
+* [An Undergraduate Course in Abstract Algebra](https://www.maths.usyd.edu.au/u/bobh/UoS/rfwhole.pdf) - Robert Howlett
+* [Elements of Abstract and Linear Algebra](https://www.math.miami.edu/~ec/book/) - E.H. Connell (University of Miami)
 * [Abstract Algebra: The Basic Graduate Year](http://www.math.uiuc.edu/~r-ash/Algebra.html) - Robert Ash
 * [Abstract Algebra: Harvard Extension (Archived)](https://web.archive.org/web/20150528171650/extension.harvard.edu/open-learning-initiative/abstract-algebra) - Benedict Gross
 * [Abstract Algebra: Harvard Extension Videos](https://www.youtube.com/playlist?list=PLA58AC5CABC1321A3) - Benedict Gross
@@ -298,15 +298,15 @@ A curated list of awesome mathematics resources.
 ### Group Theory
 
 * [Notes on Group Theory](https://www2.bc.edu/mark-reeder/Groups.pdf) - Mark Reeder
-* [Group Theory](http://www.jmilne.org/math/CourseNotes/GT.pdf) - J.S. Milne
+* [Group Theory](https://www.jmilne.org/math/CourseNotes/GT.pdf) - J.S. Milne
 * [Notes on Finite Group Theory](http://www.maths.qmul.ac.uk/~pjc/notes/gt.pdf) - Peter J. Cameron
 * [Group Theory](http://www.cns.gatech.edu/GroupTheory/index.html) - Pedrag Civitanovic
 
 ### Linear Algebra
 
-* [Fundamentals of Linear Algebra](http://www.math.ubc.ca/~carrell/NB.pdf) - James B. Carrell
+* [Fundamentals of Linear Algebra](https://www.math.ubc.ca/~carrell/NB.pdf) - James B. Carrell
 * [Linear Algebra and Matrices](https://web.archive.org/web/20140824074655/http://mathstat.helsinki.fi/~fluch/linear_algebra_1-sp07/la1.pdf) - Martin Fluch
-* [Vector Space Theory](http://www.maths.usyd.edu.au/u/bobh/UoS/MATH2902/vswhole.pdf) - Robert Howlett
+* [Vector Space Theory](https://www.maths.usyd.edu.au/u/bobh/UoS/MATH2902/vswhole.pdf) - Robert Howlett
 * [Linear Algebra](http://joshua.smcvt.edu/linearalgebra) - Jim Hefferon
 * [MIT OpenCourseWare Lectures on Linear Algebra (18.06) as Jupyter Notebooks](https://github.com/juanklopper/MIT_OCW_Linear_Algebra_18_06) - Juan Klopper
 * [Elementary Linear Algebra](http://www.numbertheory.org/book/) - Keith Matthews
@@ -318,30 +318,30 @@ A curated list of awesome mathematics resources.
 * [Linear Algebra Done Wrong](https://www.math.brown.edu/~treil/papers/LADW/LADW_2017-09-04.pdf) - Sergei Treil
 * [Immersive Linear Algebra](http://immersivemath.com/ila/index.html) - J. Ström, K. Åström, and T. Akenine-Möller
 * [Interactive Linear Algebra](https://textbooks.math.gatech.edu/ila/) - Dan Margalit and Joseph Rabinoff
-* [Linear Algebra, Infinite Dimensions, and Maple](https://people.math.gatech.edu/~herod/Hspace/Hspace.html) - James Herod
+* [Linear Algebra, Infinite Dimensions, and Maple](https://herod.math.gatech.edu/Hspace/Hspace.html) - James Herod
 
 ### Ring Theory
 
-* [Foundations of Module and Ring Theory](http://www.math.uni-duesseldorf.de/~wisbauer/book.pdf) - Robert Wisbauer (University of Düsseldorf)
+* [Foundations of Module and Ring Theory](https://www.math.uni-duesseldorf.de/~wisbauer/book.pdf) - Robert Wisbauer (University of Düsseldorf)
 
 ### Galois Theory
 
 * [An Introduction to Galois Theory](http://www.maths.gla.ac.uk/~ajb/dvi-ps/Galois.pdf) - Andrew Baker (University of Glasgow)
-* [Fields and Galois Theory](http://www.jmilne.org/math/CourseNotes/FT.pdf) - J.S. Milne
+* [Fields and Galois Theory](https://www.jmilne.org/math/CourseNotes/FT.pdf) - J.S. Milne
 * [Galois theory](http://homepages.warwick.ac.uk/~masda/MA3D5/Galois.pdf) - Miles Reid
 * [Galois Theory](https://math.illinoisstate.edu/schebol/teaching/407-14-files/Stewart-galois_theory.pdf) - Ian Stewart
 
 ### Lie Algebras
 
-* [Lie Algebras](http://www.math.harvard.edu/~shlomo/docs/lie_algebras.pdf) - Shlomo Sternberg
+* [Lie Algebras](http://people.math.harvard.edu/~shlomo/docs/lie_algebras.pdf) - Shlomo Sternberg
 
 ## Combinatorics
 
-* [Basic Combinatorics](http://www.math.utk.edu/~wagner/papers/comb.pdf) - Carl G. Wagner (University of Tennessee)
-* [Applied Combinatorics](http://people.math.gatech.edu/~trotter/book.pdf) - Mitchel T. Keller, William T. Trotter
+* [Basic Combinatorics](https://web.math.utk.edu/~wagner/papers/comb.pdf) - Carl G. Wagner (University of Tennessee)
+* [Applied Combinatorics](https://trotter.math.gatech.edu/book.pdf) - Mitchel T. Keller, William T. Trotter
 * [Notes on Combinatorics](http://www.maths.qmul.ac.uk/~pjc/notes/comb.pdf) - Peter J. Cameron
-* [Analytic Combinatorics](http://algo.inria.fr/flajolet/Publications/book.pdf) - Philippe Flajolet, Robert Sedgewick
-* [generatingfunctionology](http://www.math.upenn.edu/~wilf/DownldGF.html) - Herbert Wilf
+* [Analytic Combinatorics](https://algo.inria.fr/flajolet/Publications/book.pdf) - Philippe Flajolet, Robert Sedgewick
+* [generatingfunctionology](https://www2.math.upenn.edu/~wilf/DownldGF.html) - Herbert Wilf
 
 ### Graph Theory
 
@@ -352,25 +352,25 @@ A curated list of awesome mathematics resources.
 ## Geometry and Topology
 
 * [Fundamentals of Geometry](http://polly.phys.msu.ru/~belyaev/geometry.pdf) - Oleg A. Belyaev
-* [A=B](https://www.math.upenn.edu/~wilf/AeqB.html) - M. Petkovsek, H. Wilf, D. Zeilberger
+* [A=B](https://www2.math.upenn.edu/~wilf/AeqB.html) - M. Petkovsek, H. Wilf, D. Zeilberger
 * [Elements](http://aleph0.clarku.edu/~djoyce/java/elements/toc.html) - Euclid
 * [Euclid's Elements Redux](http://starrhorse.com/euclid/) - Daniel Callahan
-* [Mathematical Illustrations](http://www.math.ubc.ca/~cass/graphics/manual/) - Bill Casselman
+* [Mathematical Illustrations](https://www.math.ubc.ca/~cass/graphics/manual/) - Bill Casselman
 * [Byrne's Euclid](https://www.c82.net/euclid/) - Oliver Byrne
-* [Plane Geometry](http://djm.cc/library/Plane_Geometry_Wentworth_Smith_edited.pdf) - George Wentworth and David Eugene Smith (1913)
-* [Planes and Spherical Trigonometry](http://djm.cc/library/Plane_Spherical_Trigonometry_Wentworth_Smith_edited_2.pdf) - George Wentworth and David Eugene Smith (1915)
-* [Coordinate Geometry](http://djm.cc/library/Coordinate_Geometry_Fine_Thompson_edited03.pdf) - Henry Buchard Fine and Henry Dallas Thompson (1911)
-* [Analytic Geometry](http://djm.cc/library/Analytic_Geometry_Siceloff_Wentworth_Smith_edited.pdf) - Lewis Parker Siceloff, George Wentworth, David Eugene Smith (1922)
+* [Plane Geometry](https://djm.cc/library/Plane_Geometry_Wentworth_Smith_edited.pdf) - George Wentworth and David Eugene Smith (1913)
+* [Planes and Spherical Trigonometry](https://djm.cc/library/Plane_Spherical_Trigonometry_Wentworth_Smith_edited_2.pdf) - George Wentworth and David Eugene Smith (1915)
+* [Coordinate Geometry](https://djm.cc/library/Coordinate_Geometry_Fine_Thompson_edited03.pdf) - Henry Buchard Fine and Henry Dallas Thompson (1911)
+* [Analytic Geometry](https://djm.cc/library/Analytic_Geometry_Siceloff_Wentworth_Smith_edited.pdf) - Lewis Parker Siceloff, George Wentworth, David Eugene Smith (1922)
 
 ### Differential Geometry
 
 * [Introduction to Differential Geometry](https://people.math.ethz.ch/~salamon/PREPRINTS/diffgeo.pdf) - Joel W. Robbin, Dietmar A. Salamon
 * [Notes on Differential Geometry and Lie Groups](http://www.seas.upenn.edu/~jean/diffgeom.pdf) - Jean Gallier (University of Pennsylvania)
-* [Topics in Differential Geometry](http://www.mat.univie.ac.at/~michor/dgbook.pdf) - Peter W. Michor
-* [Lectures on Differential Geometry](http://mysite.science.uottawa.ca/rossmann/Differential%20Geometry%20book_files/Diffgeo.pdf) - Wulf Rossmann
-* [An Introduction to Riemannian Geometry](http://www.matematik.lu.se/matematiklu/personal/sigma/Riemann.pdf) - Sigmundur Gudmundsson (Lund University)
-* [The Geometry and Topology of Three-Manifolds](http://msri.org/publications/books/gt3m/) - W. Thurston
-* [Semi-Riemann Geometry and General Relativity](http://www.math.harvard.edu/~shlomo/docs/semi_riemannian_geometry.pdf) - Shlomo Sternberg
+* [Topics in Differential Geometry](https://www.mat.univie.ac.at/~michor/dgbook.pdf) - Peter W. Michor
+* [Lectures on Differential Geometry](https://mysite.science.uottawa.ca/rossmann/Differential%20Geometry%20book_files/Diffgeo.pdf) - Wulf Rossmann
+* [An Introduction to Riemannian Geometry](https://www.maths.lth.se/matematiklu/personal/sigma/Riemann.pdf) - Sigmundur Gudmundsson (Lund University)
+* [The Geometry and Topology of Three-Manifolds](https://www.slmath.org/publications/books/gt3m/) - W. Thurston
+* [Semi-Riemann Geometry and General Relativity](http://people.math.harvard.edu/~shlomo/docs/semi_riemannian_geometry.pdf) - Shlomo Sternberg
 * [Discrete Differential Geometry](http://www.cs.cmu.edu/~kmcrane/Projects/DDG/paper.pdf) - Keenan Crane
 
 ### Algebraic Geometry
@@ -378,8 +378,8 @@ A curated list of awesome mathematics resources.
 * [A Brief Introduction to Algebraic Geometry](https://ksda.ccny.cuny.edu/PostedPapers/rickksda1107.pdf) - R.C. Churchill
 * [Introduction to Algebraic Geometry](http://www.math.lsa.umich.edu/~idolga/631.pdf) - Igor V. Dolgachev
 * [Foundations of Algebraic Geometry](http://math.stanford.edu/~vakil/216blog/FOAGjun1113public.pdf) - Ravi Vakil
-* [Algebraic Geometry](http://www.cis.upenn.edu/~jean/algeoms.pdf) - Jean Gallier, Stephen S. Shatz (University of Pennsylvania)
-* [Algebraic Geometry](http://www.jmilne.org/math/CourseNotes/AG.pdf) - J.S. Milne
+* [Algebraic Geometry](https://www.cis.upenn.edu/~jean/algeoms.pdf) - Jean Gallier, Stephen S. Shatz (University of Pennsylvania)
+* [Algebraic Geometry](https://www.jmilne.org/math/CourseNotes/AG.pdf) - J.S. Milne
 * [Algebraic Geometry](http://www.mathematik.uni-kl.de/~gathmann/class/alggeom-2002/main.pdf) - Andreas Gathmann (University of Kaiserslautern)
 * [The Stacks Project](https://stacks.math.columbia.edu/) - Maintained by Aise Johan de Jong (Columbia)
 
@@ -391,23 +391,23 @@ A curated list of awesome mathematics resources.
 
 ### Topology
 
-* [Elementary Applied Topology](https://www.math.upenn.edu/~ghrist/notes.html) - Robert Ghrist (UPenn)
-* [Introduction to Topology](http://www.math.colostate.edu/~renzo/teaching/Topology10/Notes.pdf)
-* [Introduction to Topology](http://www.math.bme.hu/~kalex/Teaching/Spring10/Topology/TopNotes_Spring10.pdf) - Alex Küronya
+* [Elementary Applied Topology](https://www2.math.upenn.edu/~ghrist/notes.html) - Robert Ghrist (UPenn)
+* [Introduction to Topology](https://www.math.colostate.edu/~renzo/teaching/Topology10/Notes.pdf)
+* [Introduction to Topology](http://math.bme.hu/~kalex/Teaching/Spring10/Topology/TopNotes_Spring10.pdf) - Alex Küronya
 * [Introductory Topology](http://www.math.clemson.edu/~jimlb/Teaching/2009-10/Math986/Topology.pdf) - Jim L. Brown
 * [General Topology](http://webusers.imj-prg.fr/~pierre.schapira/lectnotes/Topo.pdf) - Pierre Schapira (Paris VI University)
 * [Elementary Topology Problem Textbook](http://www.pdmi.ras.ru/~olegviro/topoman/eng-book-nopfs.pdf)
-* [General Topology](http://www.math.ku.dk/~moller/e03/3gt/notes/gtnotes.pdf) - Jesper M. Møller
+* [General Topology](https://web.math.ku.dk/~moller/e03/3gt/notes/gtnotes.pdf) - Jesper M. Møller
 * [Topology Topics](http://mathonline.wikidot.com/topology)
 
 ### Algebraic Topology
 
-* [Algebraic Topology](http://www.math.cornell.edu/~hatcher/AT/AT.pdf) - Allen Hatcher
+* [Algebraic Topology](https://math.cornell.edu/~hatcher/AT/AT.pdf) - Allen Hatcher
 * [A Concise Course in Algebraic Topology](http://www.math.uchicago.edu/~may/CONCISE/ConciseRevised.pdf) - J. P. May
 * [Introduction to Algebraic Topology](http://www.math.muni.cz/~cadek/at/at.pdf) - Martin Cadek
 * [Algebra and Topology](http://webusers.imj-prg.fr/~pierre.schapira/lectnotes/AlTo.pdf) - Pierre Schapira (Paris VI University)
 * [Lecture Notes in Algebraic Topology](http://www.indiana.edu/~jfdavis/teaching/m623/book.pdf) - James F. Davis, Paul Kirk (Indiana University)
-* [Algebraic Topology](https://www.ma.utexas.edu/ibl1/courses/resources/12_15_07_grad_alg_top_mooremethod.pdf) - Michael Starbird
+* [Algebraic Topology](https://web.ma.utexas.edu/ibl1/courses/resources/12_15_07_grad_alg_top_mooremethod.pdf) - Michael Starbird
 * [Lecture Notes on Algebraic Topology](http://www.math.nus.edu.sg/~matwujie/ma5209.pdf) - Jie Wu
 
 
@@ -415,29 +415,29 @@ A curated list of awesome mathematics resources.
 
 ### Real Analysis
 
-* [MIT OpenCourseWare Lectures on Calculus](https://ocw.mit.edu/resources/res-18-001-calculus-online-textbook-spring-2005/textbook/) - G. Strang
+* [MIT OpenCourseWare Lectures on Calculus](https://ocw.mit.edu/courses/res-18-001-calculus-online-textbook-spring-2005/resources/textbook/) - G. Strang
 * [Elementary Calculus: An Approach Using Infinitesimals](http://www.math.wisc.edu/~keisler/calc.html) - Professor H. Jerome Keisler
 * [An Introduction to Real Analysis](https://www.math.ucdavis.edu/~hunter/intro_analysis_pdf/intro_analysis.pdf) - John K. Hunter (University of California at Davis)
 * [Introduction to Real Analysis](http://ramanujan.math.trinity.edu/wtrench/texts/TRENCH_REAL_ANALYSIS.PDF) - William F. Trench (Trinity University, Texas)
-* [Basic Analysis: Introduction to Real Analysis](http://www.jirka.org/ra/realanal.pdf) - Jiří Lebl
+* [Basic Analysis: Introduction to Real Analysis](https://www.jirka.org/ra/realanal.pdf) - Jiří Lebl
 * [Elementary Real Analysis](http://prac.im.pwr.wroc.pl/~kwasnicki/pl/stuff/tbb-hyper.pdf) - Thomson, Bruckner
 * [Lecture Notes in Real Analysis](http://ms.mcmaster.ca/~sawyer/Publications/Real_Analysis.pdf) - Eric T. Sawyer (McMaster University)
 * [Real Analysis](http://math.harvard.edu/~ctm/papers/home/text/class/harvard/212a/course/course.pdf) - C. McMullen
-* [Real Analysis for Graduate Students](http://bass.math.uconn.edu/3rd.pdf) - Richard F. Bass
+* [Real Analysis for Graduate Students](https://bass.math.uconn.edu/3rd.pdf) - Richard F. Bass
 * [Modern Real Analysis](http://www.math.purdue.edu/~torres/pubs/Modern-real-analysis.pdf) - William P. Ziemer (Indiana University)
 * [Mathematical Analysis Vol I](http://www.trillia.com/zakon-analysisI.html) - Elias Zakon
 * [Mathematical Analysis Vol II](http://www.trillia.com/zakon-analysisII.html) - Elias Zakon
-* [Advanced Calculus](http://www.math.harvard.edu/~shlomo/docs/Advanced_Calculus.pdf) - Lynn Loomis, Schlomo Sternberg
-* [ Analysis of Functions of a Single Variable](http://spot.colorado.edu/~baggett/analysis.html) - Lawerence Baggett
-* [The Calculus of Functions of Several Variables](http://www.synechism.org/wp/the-calculus-of-functions-of-several-variables/) - Dan Sloughter
-* [A ProblemText in Advanced Calculus](http://web.pdx.edu/~erdman/PTAC/problemtext_pdf.pdf) - John M. Erdman
+* [Advanced Calculus](http://people.math.harvard.edu/~shlomo/docs/Advanced_Calculus.pdf) - Lynn Loomis, Schlomo Sternberg
+* [ Analysis of Functions of a Single Variable](https://spot.colorado.edu/~baggett/analysis.html) - Lawerence Baggett
+* [The Calculus of Functions of Several Variables](https://synechism.org/wp/the-calculus-of-functions-of-several-variables/) - Dan Sloughter
+* [A ProblemText in Advanced Calculus](https://web.pdx.edu/~erdman/PTAC/problemtext_pdf.pdf) - John M. Erdman
 * [Calculus and Linear Algebra. Vol. 1](http://hdl.handle.net/2027/spo.5597602.0001.001) - Wilfred Kaplan, Donald J. Lewis
 * [Calculus and Linear Algebra. Vol. 2](https://quod.lib.umich.edu/s/spobooks/5597602.0002.001) - Wilfred Kaplan, Donald J. Lewis
 * [Introduction to Calculus I and II](http://www.math.odu.edu/~jhh/counter10.html) - J.H. Heinbockel
 * [Active Calculus](http://faculty.gvsu.edu/boelkinm/Home/Active_Calculus.html) - Matt Boelkins
 * [Supplements to the Exercises in Chapters 1-7 of Walter Rudin's "Principles of Mathematical Analysis"](https://math.berkeley.edu/~gbergman/ug.hndts/#Rudin) - George M. Bergman
 * [Calculus Made Easy](http://calculusmadeeasy.org/) - Silvanus P. Thompson (1910)
-* [Elements of Differential and Integral Calculus](http://djm.cc/library/Elements_Differential_Integral_Calculus_Granville_edited_2.pdf) - William Anthony Granville (1911)
+* [Elements of Differential and Integral Calculus](https://djm.cc/library/Elements_Differential_Integral_Calculus_Granville_edited_2.pdf) - William Anthony Granville (1911)
 * [Precalculus](https://stitz-zeager.com/szprecalculus07042013.pdf) - Carl Stitz, Jeff Zeager
 
 ### Harmonic Analysis
@@ -446,7 +446,7 @@ A curated list of awesome mathematics resources.
 * [Harmonic Analysis](http://www.math.uchicago.edu/~schlag/harmonicnotes.pdf) - W. Schlag
 * [Lecture Notes: Fourier Transform and its Applications](https://see.stanford.edu/materials/lsoftaee261/book-fall-07.pdf) - Brad Osgood
 * [Fourier Analysis](http://www.reed.edu/physics/courses/Physics331.f08/pdf/Fourier.pdf) - Lucas Illing
-* [Mathematics of the Discrete Fourier Transform (DFT) with Audio Applications](https://ccrma.stanford.edu/~jos/mdft) - Julius O. Smith III (Stanford University)
+* [Mathematics of the Discrete Fourier Transform (DFT) with Audio Applications](https://ccrma.stanford.edu/~jos/mdft/) - Julius O. Smith III (Stanford University)
 
 ### Complex Analysis
 
@@ -455,24 +455,24 @@ A curated list of awesome mathematics resources.
 * [A First Course in Complex Analysis](http://math.sfsu.edu/beck/papers/complex.pdf) - Matthias Beck, Gerald Marchesi, Dennis Pixton, Lucas Sabalka
 * [A Guide to Complex Variables](http://www.math.wustl.edu/~sk/books/guide.pdf) - Steven G. Krantz
 * [Complex Analysis](http://www.maths.manchester.ac.uk/~cwalkden/complex-analysis/complex_analysis.pdf) - Charles Walkden
-* [Complex Analysis](http://www.math.ku.dk/noter/filer/koman-12.pdf) - Christian Berg
+* [Complex Analysis](https://web.math.ku.dk/noter/filer/koman-12.pdf) - Christian Berg
 * [Complex Variables](http://people.math.sc.edu/girardi/m7034/book/AshComplexVariablesWithHyperlinks.pdf) - R. B. Ash, W.P. Novinger
-* [Complex Analysis](http://www.maths.lth.se/matematiklu/personal/olofsson/CompHT06.pdf) - Christer Bennewitz
+* [Complex Analysis](https://www.maths.lth.se/matematiklu/personal/olofsson/CompHT06.pdf) - Christer Bennewitz
 * [Complex Analysis](https://web.archive.org/web/20150620124453/https://www.math.washington.edu/~marshall/math_536/Notes.pdf) - Donald E. Marshall
 * [A Concise Course in Complex Analysis and Riemann Surfaces](https://gauss.math.yale.edu/~ws442/complex.pdf) - Wilhelm Schlag
-* [Complex Analysis](http://people.math.gatech.edu/%7Ecain/winter99/complex.html) - G. Cain (Georgia Tech)
+* [Complex Analysis](https://cain.math.gatech.edu/winter99/complex.html) - G. Cain (Georgia Tech)
 * [Complex Analysis](https://complex-analysis.com/) - Juan Carlos Ponce Campuzano
 
 ### Functional Analysis
 
 * [An Introduction to Functional Analysis](http://www.math.uwaterloo.ca/~lwmarcou/Preprints/LinearAnalysis.pdf) - Laurent W. Marcoux (University of Waterloo)
-* [Functional Analysis: Lecture Notes](http://users.math.msu.edu/users/jeffrey/920/920notes.pdf) - Jeff Schenker (Michigan State University)
+* [Functional Analysis: Lecture Notes](https://users.math.msu.edu/users/schenke6/920/920notes.pdf) - Jeff Schenker (Michigan State University)
 * [Functional Analysis Lecture Notes](http://www.math.hkbu.edu.hk/~zeng/Teaching/math3680/FAnotes.pdf) - T.B. Ward (University of East Anglia)
-* [Functional Analysis](http://www.maths.lancs.ac.uk/~belton/www/notes/fa_notes.pdf) - Alexander C. R. Belton
+* [Functional Analysis](https://www.maths.lancs.ac.uk/~belton/www/notes/fa_notes.pdf) - Alexander C. R. Belton
 * [Topics in Real and Functional Analysis](https://www.mat.univie.ac.at/~gerald/ftp/book-fa/fa.pdf) - Gerald Teschl
 * [Functional Analysis](http://www2.math.ou.edu/~cremling/teaching/lecturenotes/fa-new/LN-I.pdf) - Christian Remling
-* [Theory of Functions of a Real Variable](http://www.math.harvard.edu/~shlomo/docs/Real_Variables.pdf) - Shlomo Sternberg
-* [Functional Analysis](http://spot.colorado.edu/~baggett/functional.html) - Lawerence Baggett
+* [Theory of Functions of a Real Variable](http://people.math.harvard.edu/~shlomo/docs/Real_Variables.pdf) - Shlomo Sternberg
+* [Functional Analysis](https://spot.colorado.edu/~baggett/functional.html) - Lawerence Baggett
 
 ### Measure Theory
 
@@ -482,21 +482,21 @@ A curated list of awesome mathematics resources.
 * [A Crash Course on the Lebesgue Integral and Measure Theory](http://www.gold-saucer.org/math/lebesgue/lebesgue.pdf) - Steve Cheng
 * [Measure Theory](https://www.math.ucdavis.edu/~hunter/measure_theory/measure_notes.pdf) - John K. Hunter (University of California at Davis)
 * [Measure and Integration](https://people.math.ethz.ch/~salamon/PREPRINTS/measure.pdf) - Dietmar A. Salamon (ETH Zürich)
-* [Lecture notes: Measure Theory](http://www.math.ucsd.edu/~bdriver/240-00-01/Lecture_Notes/measurep.pdf) - Bruce K. Driver
+* [Lecture notes: Measure Theory](https://www.math.ucsd.edu/~bdriver/240-00-01/Lecture_Notes/measurep.pdf) - Bruce K. Driver
 
 ### Ordinary Differential Equations
 
-* [Difference Equations To Differential Equations](http://www.synechism.org/wp/difference-equations-to-differential-equations/) - Dan Sloughter
+* [Difference Equations To Differential Equations](https://synechism.org/wp/difference-equations-to-differential-equations/) - Dan Sloughter
 * [Ordinary Differential Equation](https://www.math.uni-bielefeld.de/~grigor/odelec2008.pdf) - Alexander Grigorian (University of Bielefeld)
 * [Ordinary Differential Equations: Lecture Notes](http://www.cs.bgu.ac.il/~leonid/ode_bio_files/Ionascu_LectNotes.pdf) - Eugen J. Ionascu
 * [Ordinary Differential Equations](http://www.math.lmu.de/~philip/publications/lectureNotes/ODE.pdf) - Peter Philip
-* [Ordinary Differential Equations](http://users.math.msu.edu/users/gnagy/teaching/ode.pdf) - Gabriel Nagy
-* [Ordinary Differential Equations and Dynamical Systems](http://www.mat.univie.ac.at/~gerald/ftp/book-ode/ode.pdf) - Gerald Teschl
+* [Ordinary Differential Equations](https://users.math.msu.edu/users/gnagy/teaching/ode.pdf) - Gabriel Nagy
+* [Ordinary Differential Equations and Dynamical Systems](https://www.mat.univie.ac.at/~gerald/ftp/book-ode/ode.pdf) - Gerald Teschl
 * [Notes on Differential Equations](http://leipper.org/manuals/zip-fill/dn-difeq-notes.pdf) - Bob Terrell
-* [Elementary Differential Equations](http://digitalcommons.trinity.edu/mono/8/) - William F. Trench
-* [Elementary Differential Equations With Boundary Value Problems](http://digitalcommons.trinity.edu/mono/9/) - William F. Trench
-* [Notes on Diffy Qs: Differential Equations for Engineers](http://www.jirka.org/diffyqs/) - Jiří Lebl
-* [Differential Equations](http://djm.cc/library/Differential_Equations_Phillips_edited.pdf) - H. B. Phillips (1922)
+* [Elementary Differential Equations](https://digitalcommons.trinity.edu/mono/8/) - William F. Trench
+* [Elementary Differential Equations With Boundary Value Problems](https://digitalcommons.trinity.edu/mono/9/) - William F. Trench
+* [Notes on Diffy Qs: Differential Equations for Engineers](https://www.jirka.org/diffyqs/) - Jiří Lebl
+* [Differential Equations](https://djm.cc/library/Differential_Equations_Phillips_edited.pdf) - H. B. Phillips (1922)
 
 ### Partial Differential Equations
 
@@ -512,10 +512,10 @@ A curated list of awesome mathematics resources.
 * [Introduction to Probability](https://www.dartmouth.edu/~chance/teaching_aids/books_articles/probability_book/amsbook.mac.pdf) - Charles M. Grinstead, J. Laurie Snell
 * [Introduction to Probability](http://vfu.bg/en/e-Learning/Math--Bertsekas_Tsitsiklis_Introduction_to_probability.pdf) - Dimitri P. Bertsekas, John N. Tsitsiklis (MIT)
 * [A Short Introduction to Probability](http://www.maths.uq.edu.au/~kroese/asitp.pdf) - Dirk P. Kroese (University of Queensland)
-* [Probability: Theory and Examples](https://www.math.duke.edu/~rtd/PTE/PTE4_1.pdf) - Rick Durrett
+* [Probability: Theory and Examples](https://math.duke.edu/~rtd/PTE/PTE4_1.pdf) - Rick Durrett
 * [Probability and Statistics Cookbook](https://github.com/mavam/stat-cookbook/releases/download/0.2.3/stat-cookbook.pdf) - Matthias Vallentin (UC Berkeley)
 * [The Only Probability Cheatsheet You'll Ever Need](http://www.wzchen.com/probability-cheatsheet/) - William Chen
-* [An Introduction to Probability and Random Processes](http://www.ellerman.org/Davids-Stuff/Maths/Rota-Baclawski-Prob-Theory-79.pdf) - Gian-Carlo Rota, Kenneth Baclawski
+* [An Introduction to Probability and Random Processes](https://www.ellerman.org/Davids-Stuff/Maths/Rota-Baclawski-Prob-Theory-79.pdf) - Gian-Carlo Rota, Kenneth Baclawski
 * [Foundations of Constructive Probability Theory](https://arxiv.org/pdf/1906.01803.pdf) - Yuen-Kwok Chan
 
 ### Statistics
@@ -524,7 +524,7 @@ A curated list of awesome mathematics resources.
 * [Introduction to Statistics and Data Analysis for Physicists](http://www-library.desy.de/preparch/books/vstatmp_engl.pdf) - Gerhard Bohm, Günter Zech
 * [Probability and Mathematical Statistics](http://www.iiserpune.ac.in/~ayan/MTH201/Sahoo_textbook.pdf) - Prasanna Sahoo (University of Louisville)
 * [Lectures on Statistics](http://math.arizona.edu/~faris/stat.pdf) - William G. Faris
-* [Statistical Theory](http://pages.pomona.edu/~ajr04747/Fall2009/Math152/Notes/Math152NotesFall09.pdf) - Adolfo J. Rumbos
+* [Statistical Theory](https://pages.pomona.edu/~ajr04747/Fall2009/Math152/Notes/Math152NotesFall09.pdf) - Adolfo J. Rumbos
 * [Theory of Statistics](http://mason.gmu.edu/~jgentle/books/MathStat.pdf) - James E. Gentle (George Mason University)
 * [Theory of Statistics](http://math.arizona.edu/~jwatkins/notests.pdf) - Joseph C. Watkins (University of Arizona)
 * [Glossary of Data Modeling](https://web.archive.org/web/20130523134625/http://www.aiaccess.net/e_gm.htm) - AI Access
@@ -548,10 +548,10 @@ A curated list of awesome mathematics resources.
 ### Stochastic processes
 
 * [Lectures on Stochastic Processes](http://www.math.tifr.res.in/~publ/ln/tifr24.pdf) - K. Ito (Tata Institute of Fundamental Research, Bombay)
-* [Probability and Stochastic Processes with Applications](http://www.math.harvard.edu/~knill/teaching/math144_1994/probability.pdf) - Oliver Knill (Harvard University)
+* [Probability and Stochastic Processes with Applications](http://people.math.harvard.edu/~knill/teaching/math144_1994/probability.pdf) - Oliver Knill (Harvard University)
 * [Stochastic Processes](http://statweb.stanford.edu/~adembo/math-136/nnotes.pdf) - Amir Dembo (Stanford University)
-* [Lecture Notes on Stochastic Processes](http://www.mi.fu-berlin.de/wiki/pub/CompMolBio/MarkovKetten15/stochastic_processes_2011.pdf) - Frank Noé, Bettina Keller and Jan-Hendrik Prinz (Freie Universität Berlin)
-* [Introduction to Stochastic Processes - Lecture Notes](https://www.ma.utexas.edu/users/gordanz/notes/introduction_to_stochastic_processes.pdf) - Gordan Žitković (University of Texas)
+* [Lecture Notes on Stochastic Processes](https://www.mi.fu-berlin.de/wiki/pub/CompMolBio/MarkovKetten15/stochastic_processes_2011.pdf) - Frank Noé, Bettina Keller and Jan-Hendrik Prinz (Freie Universität Berlin)
+* [Introduction to Stochastic Processes - Lecture Notes](https://web.ma.utexas.edu/users/gordanz/notes/introduction_to_stochastic_processes.pdf) - Gordan Žitković (University of Texas)
 * [Applied Stochastic Processes in science and engineering](https://www.math.uwaterloo.ca/~mscott/Little_Notes.pdf) - Matt Scott (University of Waterloo)
 * [An Introduction to Stochastic Processes in Continuous Time](http://www.math.leidenuniv.nl/~spieksma/colleges/sp-master/sp-hvz1.pdf) - Flora Spieksma (Leiden University)
 * [Markov Chains and Mixing Times](http://pages.uoregon.edu/dlevin/MARKOV/markovmixing.pdf) - David A. Levin, Yuval Peres, Elizabeth L. Wilmer
@@ -571,16 +571,16 @@ A curated list of awesome mathematics resources.
 ## Signal processing
 
 * [Introduction to Signal Processing](http://www.ece.rutgers.edu/~orfanidi/intro2sp/orfanidis-i2sp.pdf) - Sophocles J. Orfanidis (Rutgers University)
-* [Foundations of Signal Processing](http://www.fourierandwavelets.org/FSP_v1.1_2014.pdf) - Martin Vetterli, Jelena Kovacevic, Vivek K Goyal
+* [Foundations of Signal Processing](https://fourierandwavelets.org/FSP_v1.1_2014.pdf) - Martin Vetterli, Jelena Kovacevic, Vivek K Goyal
 * [An Introduction to Statistical Signal Processing](https://ee.stanford.edu/~gray/sp.pdf) - Robert M. Gray, Lee D. Davisson
 * [Think DSP](https://greenteapress.com/wp/think-dsp/) - Allen B. Downey
-* [Linear algebra, signal processing, and wavelets. A unified approach.](https://www.uio.no/studier/emner/matnat/math/MAT-INF2360/v15/kompendium/applinalgpython.pdf) - Øyvind Ryan (University of Oslo)
+* [Linear algebra, signal processing, and wavelets. A unified approach.](https://www.uio.no/studier/emner/matnat/math/nedlagte-emner/MAT-INF2360/v15/kompendium/applinalgpython.pdf) - Øyvind Ryan (University of Oslo)
 
 
 ## Mathematics for Computer Science
 
 * [Mathematics for Computer Science](https://people.csail.mit.edu/meyer/mcs.pdf) - Eric Lehman, F. Thomson Leighton, Albert R. Meyer
-* [Algorithms and Complexity](http://www.math.upenn.edu/%7Ewilf/AlgComp3.html) - H. Wilf
+* [Algorithms and Complexity](https://www2.math.upenn.edu/~wilf/AlgComp3.html) - H. Wilf
 * [Lecture Notes on Optimization](http://people.eecs.berkeley.edu/~varaiya/papers_ps.dir/NOO.pdf) - Pravin Varaiya
 * [Information Theory, Inference, and Learning Algorithms](http://www.inference.org.uk/mackay/itila/book.html) - David J. C. MacKay
 * [The Chaos Textbook: Mathematics in the age of the computer](https://hypertextbook.com/chaos/) - Glenn Elert
@@ -604,6 +604,6 @@ A curated list of awesome mathematics resources.
 
 # License
 
-[![CC0](http://i.creativecommons.org/p/zero/1.0/88x31.png)](http://creativecommons.org/publicdomain/zero/1.0/)
+[![CC0](https://licensebuttons.net/p/zero/1.0/88x31.png)](http://creativecommons.org/publicdomain/zero/1.0/)
 
-To the extent possible under law, [Cyrille Rossant](http://cyrille.rossant.net) has waived all copyright and related or neighboring rights to this work.
+To the extent possible under law, [Cyrille Rossant](https://cyrille.rossant.net/) has waived all copyright and related or neighboring rights to this work.