Итак, я изо всех сил пытаюсь изменить шрифт для заголовка / раздела / подраздела в латексе.
Вот мой код:
% !TEX TS?program = pdflatexmk
\documentclass[fontsize=12pt]{book}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{mathpazo}
%changing font of section/chapter title
\usepackage{fontspec}
\usepackage{titlesec}
\newfontfamily\headingfont{Papyrus}
\titleformat{\chapter}{\LARGE\headingfont}
\titleformat{\section}{\LARGE\headingfont}
\titleformat{\subsection}{\Large\headingfont}
\titleformat{\subsubsection}{\large\headingfont}
\title{my report}
\author{user name}
\date
\linespread{1.5}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\maketitle
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\tableofcontents
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\chapter{introduction}
text : intro
\section{first section}
text : section
\subsection{this subsection}
text :section
\subsubsection{this and that subsection}
text :subsub
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\end{document}
И это вывод: 
Шрифт реализован только в chapter и subsection.Не для других.А также нумерация потеряна.Например, без titlesec и fontspec это выглядит так.При этом нумерация глав и подразделов теряется.Я не могу найти ошибку.(также раздражает использование fontspec, поскольку он не может найти шрифт по умолчанию для латекса, поэтому пришлось скопировать и вставить файл otf в рабочий каталог)
