\restrictionThe \restriction command is used in LaTeX to denote the restriction of a function to a subset of its domain. It is typically represented by a vertical bar with a subscript indicating the subset. This is useful in mathematical contexts where a function is defined on a larger set but is being considered only on a specific subset.
The function f restricted to the subset A.
f \restriction_AThe function g restricted to the interval [0,1].
g \restriction_{[0,1]}The function h restricted to the positive real numbers.
h \restriction_{\{x \in \mathbb{R} : x > 0\}}