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matt grime
matt grime is offline
#2
Dec7-04, 09:24 AM
Sci Advisor
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P: 9,398
A'A idempotent means A'AA'A=A'A, don't know what you mean by ' though - if A and A' are invertible then you can cancel and get AA'=I but you don't know A and A' are invertible do you?