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\newtheorem

\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 -- a string of letters. 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.

• 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.