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