A difficult problem about linear algebra.Help

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The discussion centers on the properties of idempotent matrices, specifically verifying that if the product of two matrices, AB, is idempotent, then the product BA is also idempotent. An idempotent matrix is defined as a matrix that, when multiplied by itself, yields the same matrix. The participants delve into the definitions and properties of matrix multiplication and idempotency to arrive at a conclusive proof of this property.

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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.
 
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