involution
Sign in to saveAlso known as involutory function, involutive function, self-inverse function
function that is its own inverse
~13 min read
Encyclopedic overview
An involution is a function f : X → X that, when applied twice, brings one back to the starting point.
In mathematics, an involution, involutory function, or self-inverse function is a function f that is its own inverse, f(f(x)) = x for all x in the domain of f. Equivalently, applying f twice produces the original value.
Excerpted from Wikipedia’s “involution” article, available under the CC BY-SA 4.0 licence.