Also known as involutory function, involutive function, self-inverse function
function that is its own inverse
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.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).