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A difficult problem about linear algebra.Help

  1. Oct 28, 2006 #1
    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.
     
  2. jcsd
  3. Oct 29, 2006 #2

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    Do you know what an idempotent matrix is? Where are you getting stuck?
     
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