In mathematics, the restriction of a function $f$ is a new function, denoted $f\vert_A$ or $f {\restriction_A}$, obtained by choosing a smaller domain $A$ for the original function $f$.
The function $f$ is then said to extend $f\vert_A$.
In mathematics, the restriction of a function $f$ is a new function, denoted $f\vert_A$ or $f {\restriction_A}$, obtained by choosing a smaller domain $A$ for the original function $f$.
The function $f$ is then said to extend $f\vert_A$.