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`theorem`

Synopsis:

\begin{theorem}theorem body\end{theorem}

Produces ‘`Theorem n`’ in boldface followed by

`\newtheorem`

(see \newtheorem).
\newtheorem{lem}{Lemma} % in preamble \newtheorem{thm}{Theorem} ... \begin{lem} % in document body text of lemma \end{lem} The next result follows immediately. \begin{thm}[Gauss] % put `Gauss' in parens after theorem head text of theorem \end{thm}

Most new documents use the packages `amsthm`

and `amsmath`

from the American Mathematical Society. Among other things these
packages include a large number of options for theorem environments,
such as styling options.