LuaLaTeX et maths : pourquoi ma police n'apparaît-elle pas ?

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\documentclass[a4paper,fontsize=24pt]{scrartcl}
\usepackage{fontspec}
\setmainfont{Luciole-Bold.ttf}[ItalicFont = Luciole-Bold-Italic.ttf]
\setsansfont{Luciole-Bold.ttf}
\setmonofont{Luciole-Bold.ttf}
\usepackage{polyglossia}
\setdefaultlanguage{french}
\usepackage{mathtools, amssymb, mathrsfs}
\usepackage[onehalfspacing]{setspace} % interlignes \begin-end{onehalfspacing} ou {doublespacing}
% alinéa
\usepackage{etoolbox}
\makeatletter
\patchcmd{\raggedright}{\parindent\z@}{}{}{\err}
\makeatother
\begin{document}
$ a^{n} $ est défini par :
\[ a^{n} = \underbrace{a \times a \times \cdots \times a}_{n \text{ fois}} \]
\[ a^{-n} = \frac{1}{a^{n}} = \underbrace{\frac{1}{a} \times \cdots \times \frac{1}{a}}_{n \text{ fois}} \]
\end{document}
 
 
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