恆等函數
Sign in to saveAlso known as identity map, identity transformation, identity operator, id, Identity function, identity relation
function that always returns the same value that was used as its argument
Article · 中文
恆等函數（英語：Identity function）是数学中对于傳回和其輸入值相同的函數的称呼。換句話說，恆等函數為函數。
Abstract from DBpedia / Wikipedia · CC BY-SA