恒こう等とう関かん数すう

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Meanings

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identity function; identity operator

A mathematical function that returns its input unchanged. Used in algebra, set theory, and functional programming.

恒こう等とう関かん数すうは入にゅう力りょくをそのまま返かえす関かん数すうだ。
The identity function is a function that returns its input unchanged.