# Font size in equation block and how to change it globally

I am trying to know what font size is used in equation block:

$$...$$


And I stuck because I cannot found it anywhere on the Internet. Not even know how to change the size of equation, but how to know the default or current font size. I found that in equation block \displaystyle font style is used, but I don't know what size it is using.

Here is my settings in TeX code (I used Basic Paper in Overleaf):

% !TeX encoding = UTF-8
% !TEX program = xelatex

\documentclass{article}

\usepackage{polyglossia}
\setdefaultlanguage{russian}
\setotherlanguage{english}
\newfontfamily\russianfont[Script=Cyrillic]{Times New Roman}

\usepackage{amsmath}
\usepackage{fontspec}
\usepackage{unicode-math}
\setmathfont{Latin Modern Math}

\usepackage{indentfirst}

• I guess it will be a 10pt font, the default. If you use the class option 11pt or 12pt, the whole document will be typeset in a larger font. You can selectively choose a larger font for the equation by saying something like {\LARGE$$...$$}. – gernot Dec 11 '16 at 16:28
• Welcome to TeX.SE. You can see tex.stackexchange.com/questions/60453/… or tex.stackexchange.com/questions/5148/…. Perphaps you can resolve the your problem .I agree with the answer given by Gernot. In \documentclass{article} you must use class option 11pt or 12pt. – Sebastiano Dec 11 '16 at 16:28

I actually figured it out somehow. Here is the code:

\newcommand{\mathfontsize}{14pt}

\usepackage{environ}
\NewEnviron{myequation}{
$$\fontsize{\mathfontsize}{\mathfontsize*1.2}\selectfont \BODY$$
}

% Using:

\begin{myequation}
{\symit \Gamma} + \Sigma
\end{myequation}


I don't remember where I found some parts of it, some code I found here, some not. But overall, thank you for participating!

• See our comments. As he wrote Gernot, it is easier the solution, {\LARGE$$...$$}. You try with Papeeria. – Sebastiano Dec 11 '16 at 16:39