If A is a square matrix such that A² = A, then A is called:
If A is a square matrix such that A² = A, then A is called:
- A. Idempotent matrix
- B. Nilpotent matrix
- C. Involutory matrix
- D. Orthogonal matrix
Answer: A) Idempotent matrix
Explanation: A matrix satisfying A² = A is called idempotent. Nilpotent means A² = 0 (for some power). Involutory means A² = I. Orthogonal means AA' = I.
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