I have the following MWE
\documentclass[12pt, A4paper]{article}
\usepackage{amssymb}
\usepackage{amsmath}
\usepackage{amsthm}
\newtheorem*{solution}{Solution}
\begin{document}
This is a proof:
\begin{solution}
abcdef
\end{solution}
\end{document}
Although I tried several attempts, I was not able to change the font style in solution environment. Basically, I would like normal font instead of italics. Any hint? Thanks in advance.
\theoremstyle{definition}before\newtheorem*{solution}{Solution}. – egreg Mar 15 '18 at 23:45