Involution (mathematics)
Function that is its own inverse / From Wikipedia, the free encyclopedia
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In mathematics, an involution, involutory function, or self-inverse function[1] is a function f that is its own inverse,
- f(f(x)) = x
Function that is its own inverse
that, when applied twice, brings one back to the starting point.for all x in the domain of f.[2] Equivalently, applying f twice produces the original value.