My text is in Persian/Kurdish and therefore I use a different font for the text and the font has different characteristics like height, I just want to change the font size that is used in Math mode. I want to add some statements perhaps in the preamble affecting the whole document.
[Tex/LaTex] How to change the font size in Math mode in LaTeX
fontsmath-mode
Related Solutions
You seem to have an XY problem. In LuaTeX or XeTeX, you can turn off old-style numbers with
\usepackage{unicode-math}
\defaultfontfeatures{Numbers=Lining}
\setmainfont{Fira Sans}
\setsansfont{Fira Sans}
\setmonofont{Fira Mono}
\setmathfont{Fira Math}
Or \usepackage[fira]{fontsetup} might work.
In PDFTeX, load
\usepackage[lining, sfdefault]{FiraSans}
\usepackage{FiraMono}
to load Fira Sans with lining numbers as the default font, and Fira Mono as the matching monospace font. You would also need to load a sans-serif math package, and set its letters and numerals to use the main text font with \usepackage[italic]{mathastext}.
You can easily obtain a horrible document mixing Utopia as text font and Palatino (mathpazo) for math by doing
\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{mathpazo}
\renewcommand{\rmdefault}{put}
\usepackage[math]{blindtext} % just to produce mock text
\begin{document}
\blindmathtrue
\blindmathpaper
\end{document}
Even more appalling is when Computer Modern is used for math
\documentclass{article}
\usepackage[T1]{fontenc}
\renewcommand{\rmdefault}{put}
\usepackage[math]{blindtext}
\begin{document}
\blindmathtrue
\blindmathpaper
\end{document}
Here is the same with fourier:
Take your pick, but be aware of the following advices
never load other math font packages along with
fourier, because this package sets up different encodings for the math font and you easily get wrong symbolsnever mix different fonts for text and math
Best Answer
LaTeX has a
\DeclareMathSizescommand to specify the math font sizes, by default this isso
says 10pt text font should use 10pt math font and 7pt in scripts and 5pt in scriptscript size
would make the math use 9pt 7pt and 6pt for a 10pt text font.