## Definition ## In a commutative [[Z-algebra]] $A$, given terms $a:A$, $b:A$, $c:A$ a __quadratic function__ is a function $f:A \to A$ defined as $f(x) \coloneqq a \cdot x^2 + b \cdot x + c$, where $x^2$ is the [[square function]] ## See also ## * [[square function]] * [[Z-algebra]]