Also known as involutory function, involutive function, self-inverse function
function that is its own inverse
在数学中，对合（英語：involution）或对合函数，是逆函数等于自身的函数，就是说 f(f(x)) = x 对于所有 f 的定义域中的 x。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).