Solution: Since A is idempotent, we have A² = A (I –
Solution: Since A is idempotent, we have A² = A (I – A) ² = I² + A² – 2IA (I – A) ² = I + A – 2A (I – A) ² = I -A 》 I – A is idempotent Since A is inevitable, A‐¹ exists A² = A Multiply both sides […]
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