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tghg
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A difficult problem about linear algebra.Help!
Suppose that A is a m*n matrix，B is a n*m matrix,and AB is a idempotent matrix.
Please verify that BA is also a idempotent matrix.
Suppose that A is a m*n matrix，B is a n*m matrix,and AB is a idempotent matrix.
Please verify that BA is also a idempotent matrix.