You wrote,
I want to know is there anything that I can [do to] make it better
If the GL
term is an operator, it's best to typeset it using upright roman letters. Separately, I think the overall look would improve if slightly greater visual prominence were given to the curly braces, e.g., by making them \big
.

\documentclass{article}
\usepackage{amssymb} % for '\mathbb' macro
\usepackage{amsmath} % for '\DeclareMathOperator' macro
\DeclareMathOperator{\GL}{GL}
\usepackage{mathtools} % for '\eqqcolon' macro
\begin{document}
\[
\GL(V) \eqqcolon \bigl\{ V\in \mathbb{C}^n : \exists W\in \mathbb{C}^n, VW = WV = 1 \bigr\}
\]
\end{document}
$...$
or\(...\)
block. – Davislor Sep 6 '20 at 17:25GL(V)
is the product of a variable G and a function L, or a function named GL. In the latter case, you might want to format it differently, e.g.\DeclareMathOperator{\GL}{GL}
or\newcommand{\GL}{\mathop{\textnormal{\slshape GL}}}
. – Davislor Sep 6 '20 at 17:36