GNU Info

(latex.info)\newtheorem

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Enter node , (file) or (file)node

\newtheorem
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      \newtheorem{env_name}{caption}[within]
      \newtheorem{env_name}[numbered_like]{caption}

   This command defines a theorem-like environment.

`env_name'
     The name of the environment to be defined. A string of letters.
     It must not be the name of an existing environment or counter.

`caption'
     The text printed at the beginning of the environment, right before
     the number. This may simply say "Theorem", for example.

`within'
     The name of an already defined counter, usually of a sectional
     unit.  Provides a means of resetting the new theorem counter
     *within* the sectional unit.

`numbered_like'
     The name of an already defined theorem-like environment.

   The `\newtheorem' command may have at most one optional argument.