同どう一いつ原げん理り

noun

principle of identity; law of identity

A logical principle stating that each thing is the same with itself and different from another. Used in formal logic and philosophy.

• 同どう一いつ原げん理りは、論ろん理り学がくの基き本ほん的てきな法ほう則そくの一ひとつです。

  The principle of identity is one of the fundamental laws of logic.