High Quality Content by WIKIPEDIA articles! In logic, the law of identity states that an object is the same as itself: A ? A. Any reflexive relation upholds the law of identity. When discussing equality, the fact that "A is A" is a tautology.Parmenides the Eleatic (circa BCE. 490) formulated the principle Being is (eon emmenai) as the foundation of his philosophy. Aristotle, by contrast, took the Principle of contradiction as his first principle, and does not refer explicitly to the Law of Identity, although the law is often attributed to him (particularly by the proponents of Ayn Rand's writings).

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