LaTeX forum ⇒ Text Formatting ⇒ Apostrophe in title section gets rendered as a section symbol

[Tolaso]

I'm not sure if this is the proper forum to post the question but here goes.

I'm using the memoir document class to typeset a book for my math class. However, when I type the section

Code: [Select all] [Expand/Collapse] [Download] ({untitled.tex}) Open in Overleaf

\section{Κανόνας \textlatin{DeL' Hospital}}

while in the TOC it gets printed right as

Κανόνας DeL' Hospital

in the header of the current chapter it gets printed as

Στιγμιότυποαπό2018-04-0713-36-19.jpg (5 KiB) Viewed 126 times

I'm presenting the entire preamble since in a vanilla document I cannot reproduce the problem , although in the header of the vanilla I don't get that weird symbol but I got ' either.

Code: [Select all] [Expand/Collapse] [Download] ({untitled.tex}) Open in Overleaf

\documentclass[11pt, a4paper]{memoir}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsthm}
\renewcommand\qedsymbol{$\blacklozenge$}
\usepackage[shortlabels]{enumitem}
\usepackage{cancel}
\usepackage{bigints}
\usepackage[most]{tcolorbox}
\usepackage[utf8]{inputenc}
\usepackage[english, greek]{babel}
\usepackage{multicol}
 
%chapter style ( Bringhurst chapter style)
 
\usepackage[T1]{fontenc}
% not then font used by Bringhurst, but anyway:
\usepackage{libertine}
% we want to letterspace uppercased words and those in small caps, so:
\usepackage{microtype}
 
% the chapter style:
\usepackage{xcoffins,xcolor}
\NewCoffin\main
\NewCoffin\titleline
\NewCoffin\chapternumber
 
\makechapterstyle{Bringhurst}{%
	\renewcommand*\chapterheadstart{}
	\renewcommand*\printchaptername{}
	\renewcommand*\chapternamenum{}
	\renewcommand*\afterchapternum{}
	% numbered chapters:
	\renewcommand*\printchapternum{%
		\SetHorizontalCoffin\chapternumber{%
			\textcolor{black!10}{\thechapter}%
		}%
		\ScaleCoffin\chapternumber{8}{8}%
	}
	% unnumbered chapters:
	\renewcommand*\printchapternonum{\SetHorizontalCoffin\chapternumber{}}
	\renewcommand*\printchaptertitle[1]{%
		\memRTLraggedright\normalfont\large\MakeUppercase{\textls[75]{##1}}}
	\renewcommand*\afterchaptertitle{%
		\vskip.5\onelineskip
		\SetHorizontalCoffin\titleline{\color{black!50}\rule{\linewidth}{1.5pt}}%
		\JoinCoffins\main\titleline
		\JoinCoffins*\main\chapternumber(\textwidth+\marginparsep,-4\baselineskip)%
		\TypesetCoffin\main
		\vskip\onelineskip
	}
}
 
\chapterstyle{Bringhurst}
 
% sections and subsections:
\setsecnumformat{\normalfont\csname the#1\endcsname\quad}
\setsecnumdepth{subsection}
\setcounter{secnumdepth}{2}
\maxtocdepth{subsection}
 
%tcolorbox
 
\usepackage{tcolorbox}
 
%tikz & pgf
 
\usepackage{pgf,tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=1.11}
\usepackage{tkz-tab}
\usetikzlibrary{fit, shapes,snakes,arrows,intersections, backgrounds,calc, trees, hobby}
\usetikzlibrary{scopes,svg.path,shapes.geometric,shadows}
\usetikzlibrary{positioning}
\tikzset{point/.style={circle,draw=black,inner sep=0pt,minimum size=3pt}}
\usetikzlibrary{datavisualization.formats.functions}
 
\newcommand*\circled[1]{\tikz[baseline=(char.base)]{%
		\node[shape=circle, fill=cyan!20!,draw,inner sep=2pt] (char) {#1};}}
 
%horizontal nested sets for numbers
 
\newcommand\drawnestedsets[4]{
	% initial position
	\def\position{#1}
	% number of sets
	\def\nbsets{#2}
	% list of sets
	\def\listofnestedsets{#3}
	% reversed list of colors
	\def\reversedlistofcolors{#4}
 
	% position and draw labels of sets
	\coordinate (circle-0) at (#1);
	\coordinate (set-0) at (#1);
	\foreach \set [count=\c] in \listofnestedsets {
		\pgfmathtruncatemacro{\cminusone}{\c - 1}
		% label of current set (below previous nested set)
		\node[right=3pt of circle-\cminusone,inner sep=0]
		(set-\c) {$\mathbb{\set}$};
		% current set (fit current label and previous set)
		\node[ellipse,inner sep=0,fit=(circle-\cminusone)(set-\c)]
		(circle-\c) {};
	}
 
	% draw and fill sets in reverse order
	\begin{scope}[on background layer]
		\foreach \col[count=\c] in \reversedlistofcolors {
			\pgfmathtruncatemacro{\invc}{\nbsets-\c}
			\pgfmathtruncatemacro{\invcplusone}{\invc+1}
			\node[ellipse,draw,fill=\col,inner sep=0,
			fit=(circle-\invc)(set-\invcplusone)] {};
		}
	\end{scope}
}
 
%labeling figures
\usepackage{caption}
\usepackage{float}
 
%fontawesome
 
\usepackage{fontawesome}
\renewcommand{\thefootnote}{\faBullhorn}
 
%custom commands / environments
 
\newtheorem*{sol}{Λύση}
\renewcommand{\thepage}{\roman{page}}%
\newtheorem{example}{Παράδειγμα}
\DeclareSymbolFont{eulargesymbols}{U}{zeuex}{m}{n}
\DeclareMathSymbol{\intop}{\mathop}{eulargesymbols}{"52}
 
%remove chapter enumeration in equations
 
\usepackage{chngcntr}
\counterwithout{equation}{chapter}
 
%true or false boxes
 
\usepackage{tabularx}
\newcounter{abc}
\renewcommand{\theabc}{\stepcounter{abc}\alph{abc}}
\newcommand{\answerbox}{\fbox{\phantom{M}}}
 
%floor function
 
\usepackage{pgfplots}
\tikzset{
	declare function={Floor(\x)=round(\x-0.5);},
	declare function={Ceil(\x)=round(\x+0.5);}
}
 
 
\makeatletter
\long\def\ifnodedefined#1#2#3{%
	\@ifundefined{pgf@sh@ns@#1}{#3}{#2}%
}
\newif\iffirstmarker
\firstmarkertrue
 
\pgfplotsset{
	discontinuous/.style={
		scatter,
		options/.style={},
		execute at end plot visualization={\global\firstmarkertrue},
		scatter/@pre marker code/.code={
			\iffirstmarker
			\global\firstmarkerfalse
			\else
			\ifnodedefined{marker}{
				\pgfpointdiff{\pgfpointanchor{marker}{center}}%
				{\pgfpoint{0}{0}}%
				\ifdim\pgf@y>0pt
				\tikzset{options/.style={mark=*}}
				\draw [densely dashed] (marker-|0,0) -- (0,0);
				\draw plot [mark=*,mark options={fill=white}] coordinates {(marker-|0,0)};
				\else
				\ifdim\pgf@y<0pt
				\tikzset{options/.style={mark=*,fill=white}}
				\draw [densely dashed] (marker-|0,0) -- (0,0);
				\draw plot [mark=*] coordinates {(marker-|0,0)};
				\else
				\tikzset{options/.style={mark=none}}
				\fi
				\fi
			}{
			\tikzset{options/.style={mark=none}}        
		}
		\fi
		\coordinate (marker) at (0,0);
		\begin{scope}[options]
		},
		scatter/@post marker code/.code={\end{scope}}
}
}
 
%complete gibberish
 
\usetikzlibrary{shadows.blur}
 
\usepackage{titletoc}
 
\usepackage{calc}
 
\definecolor{yourcolor}{HTML}{008bb2}
 
%define new chapter style (just for a nicer look)
\makechapterstyle{mystyle}{%
	\chapterstyle{default}
	\renewcommand*{\chapnumfont}{\normalfont\Huge\sffamily\bfseries}
	\renewcommand*{\chaptitlefont}{\normalfont\huge\sffamily\itshape\color{yourcolor}}
	\settowidth{\chapindent}{\chapnumfont 111}
	\renewcommand*{\chapterheadstart}{}
	\renewcommand*{\chapnamefont}{\hfill\color{yourcolor}\normalfont\Huge\sffamily\bfseries}
	\renewcommand*{\printchapternum}{%
		\begin{tikzpicture}[baseline={([yshift=-.6ex]current bounding box.center)}]
		\node[fill=yourcolor,circle,text=white] {\thechapter};
		\end{tikzpicture}\\[1ex]
		\hrule height 1.5pt}
	\renewcommand*{\printchaptertitle}[1]{%
		{\chaptitlefont ##1}}
}
 
%use new chapter style
\chapterstyle{mystyle}
 
%command to print the acutal minitoc
\newcommand{\printmyminitoc}{\noindent\hspace{-2cm}\begin{tikzpicture}
	\node[rounded corners,align=left,fill=yourcolor, blur shadow={shadow blur steps=5}, inner sep=5mm]{%
		\color{white}%
		\begin{minipage}{8cm}%minipage trick
		\printcontents[chapters]{}{1}{}
		\end{minipage}};
	\end{tikzpicture}}
 
 
%plot of Weierstrass function
 
\makeatletter
\pgfmathdeclarefunction{weierstrass}{4}{%
	\pgfmathfloattofixed@{#4}%
	\afterassignment\pgfmath@x%
	\expandafter\c@pgfmath@counta\pgfmathresult pt\relax%
	\pgfmathfloatcreate{1}{0.0}{0}%
	\let\pgfmathfloat@loc@TMPr=\pgfmathresult
	\pgfmathfloatpi@%
	\let\pgfmathfloat@loc@TMPp=\pgfmathresult%
	\edef\pgfmathfloat@loc@TMPx{#1}%
	\edef\pgfmathfloat@loc@TMPa{#2}%
	\edef\pgfmathfloat@loc@TMPb{#3}%
	\pgfmathloop
	\ifnum\c@pgfmath@counta>-1\relax%
	\pgfmathfloatparsenumber{\the\c@pgfmath@counta}%
	\let\pgfmathfloat@loc@TMPn=\pgfmathresult%
	\pgfmathpow{\pgfmathfloat@loc@TMPa}{\pgfmathfloat@loc@TMPn}%
	\let\pgfmathfloat@loc@TMPe=\pgfmathresult%
	\pgfmathpow{\pgfmathfloat@loc@TMPb}{\pgfmathfloat@loc@TMPn}%
	\pgfmathmultiply{\pgfmathresult}{\pgfmathfloat@loc@TMPp}%
	\pgfmathmultiply{\pgfmathresult}{\pgfmathfloat@loc@TMPx}%
	\pgfmathdeg{\pgfmathresult}%
	\pgfmathcos{\pgfmathresult}%
	\pgfmathmultiply{\pgfmathresult}{\pgfmathfloat@loc@TMPe}%
	\pgfmathadd{\pgfmathresult}{\pgfmathfloat@loc@TMPr}%
	\let\pgfmathfloat@loc@TMPr=\pgfmathresult
	\advance\c@pgfmath@counta by-1\relax%
	\repeatpgfmathloop%
}
 
\begin{document}
 
\section{Κανόνας \textlatin{DeL' Hospital}}
 
\end{document}

[Courtney McDaniel]

Hah, I think that this problem is so common among beginners, even a post dedicated to it)

Thanks, it worked!