Last Updated：2025/11/29

(logic) The logical principle that anything equals itself, expressed by the symbolic equation A=A.

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law of identity

Source Word

law of identity

Noun

(logic) The logical principle that anything equals itself, expressed by the symbolic equation A=A.

Japanese Meaning

論理学における原理で、あらゆるものが自己と等しいという法則。記号で A＝A と表現されることから、同一性や恒等性の法則とも呼ばれる。

In his philosophy lecture, he explained the law of identity by writing A = A on the blackboard.

彼は哲学の講義で、黒板にA＝Aと書きながら、何でもそれ自身と等しいという論理原理（同一律）を説明した。

Sense（1）

(logic) The logical principle that anything equals itself, expressed by the symbolic equation A=A.

The law of identity states that an apple is an apple.