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Definitions

LaTeX has support for making new commands of many different kinds.

• \newcommand & \renewcommand		(Re)define a new command.
• \providecommand		Define a new command, if name not used.
• \makeatletter & \makeatother		Change the status of the at-sign character.
• \@ifstar		Define your own commands with *-variants.
• \newcounter		Define a new counter.
• \newlength		Define a new length.
• \newsavebox		Define a new box.
• \newenvironment & \renewenvironment		Define a new environment.
• \newtheorem		Define a new theorem-like environment.
• \newfont		Define a new font name.
• \protect		Using tricky commands.
• \ignorespaces & \ignorespacesafterend		Discard extra spaces.