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Involution ○꠹｜Definition｜1st｜20251119205401-00-⌔

Involution (mathematics) - Wikipedia

Involution (mathematics)

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In mathematics, an involution, involutory function, or self-inverse function1 is a function f that is its own inverse, f (f (x)) = x for all x in the domain of f.2 Equivalently, applying f twice produces the original value.

Printed 2026-06-28.

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Footnotes

  1. Robert Alexander Adams, Calculus: Single Variable, 2006, ISBN 0321307143, p. 165 ↩

  2. Russell, Bertrand (1903), Principles of mathematics (2nd ed.), W. W. Norton & Company, Inc, p. 426, ISBN 9781440054167 ↩

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