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2 % Things dealing with arrows in a category. Or functions, basically.
5 % The identity operator/arrow on its argument.
6 \newcommand*
{\identity}[1]{ \operatorname{id
}_
{{#1}} }
8 % The composition of two arrows/functions. For example, the
9 % composition of g with f is \compose{g}{f}\of{x} === g\of{f\of{x}}.
10 \newcommand*
{\compose}[2]{ {#1}\circ{#2} }
12 % The inverse of an arrow, function, or whatever.
13 \newcommand*
{\inverse}[1]{ #1^
{-
1} }