add missing \ on page 156 #226

	name: CI

	on:
	push:
	branches:
	- master
	paths-ignore:
	- '**.md'
	pull_request:
	paths-ignore:
	- '**.md'


	jobs:
	skip_check:
	name: Skip check
	runs-on: ubuntu-latest
	outputs:
	should_skip: ${{ steps.skip_check.outputs.should_skip }}
	steps:
	- id: skip_check
	uses: fkirc/skip-duplicate-actions@v4
	with:
	cancel_others: 'true'
	paths: '["src/**", "Makefile", "fixdate.pl"]'

	check:
	name: Check LaTeX
	needs: skip_check
	if: ${{ needs.skip_check.outputs.should_skip != 'true' }}
	runs-on: ubuntu-latest
	container: ghcr.io/xu-cheng/texlive-small:latest

	steps:
	- name: Install tools
	run: \|
	apk add make
	tlmgr update --self
	tlmgr install chktex
	tlmgr install latexindent

	- name: Checkout the repository
	uses: actions/checkout@v3

	- name: Run ChkTeX
	run: \|
	make src/title.tex
	cd src
	chktex lshort.tex -l ../.chktexrc

	- name: Run latexindent
	run: \|
	latexindent -kv -m -l .localSettings.yaml src/*.tex > /dev/null
	cat src/indent.log

	build_latex:
	name: Build LaTeX
	needs: skip_check
	if: ${{ needs.skip_check.outputs.should_skip != 'true' }}
	runs-on: ubuntu-latest
	container: ghcr.io/xu-cheng/texlive-full:latest

	steps:
	- name: Install tools
	run: \|
	tlmgr update --self
	tlmgr update --all
	apk add make
	apk add git
	apk add py3-pygments

	- name: Checkout the repository
	uses: actions/checkout@v3
	with:
	submodules: recursive

	- name: Build all
	run: \|
	make all

	- name: Upload artifacts
	uses: actions/upload-artifact@v3
	with:
	name: result
	path: \|
	*.pdf
	pdfbuild

Provide feedback