Definition:Composition

From CS2800 wiki
Definition: Composition
Given a function [math]f : A \href{/cs2800/wiki/index.php/%E2%86%92}{→} B [/math] and a function [math]g : B \href{/cs2800/wiki/index.php/%E2%86%92}{→} C [/math], the composition of [math]g [/math] with [math]f [/math] (written [math]g \href{/cs2800/wiki/index.php/%E2%88%98}{∘} f [/math]) is the function [math]g \href{/cs2800/wiki/index.php/%5Ccirc}{\circ} f : A \href{/cs2800/wiki/index.php/%E2%86%92}{→} C [/math] given by [math](g \href{/cs2800/wiki/index.php/%5Ccirc}{\circ} f)(a) := g(f(a)) [/math].