theorem (LaTeX2e unofficial reference manual (November 2018))

Next: titlepage, Previous: thebibliography, Up: Environments [Contents][Index]

### 8.25 `theorem`

Synopsis:

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

Produces ‘`Theorem n`’ in boldface followed by theorem body in italics. The numbering possibilities for n are described under `\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.

Unofficial LaTeX2e reference manual