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latex2e: Footnotes
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latex2e: Counters
12 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. · \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.