latex中输入定义

\documentclass[times, 10pt,twocolumn]{article}
....
\usepackage{amsmath,amsthm,amssymb} % 引入 AMS 數學環境g
....
\newtheorem{definition}{Definition}
\newtheorem{theorem}{Theorem}(for 公理)

\begin{document}
...
(如果只是definition，之用引入amssymb包)
\begin{definition}[Name of the Definition]
content of the definition
\end{definition}

....