Problem( ):Let be such that and are invertible and such that . Prove that is invertible and .

Remark:If you have seen this problem before, or particularly where it comes from, please resist posting.

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- November 23rd 2010, 09:01 PMDrexel28Integer Valued Matrix
**Problem( ):**Let be such that and are invertible and such that . Prove that is invertible and .

*Remark:*If you have seen this problem before, or particularly where it comes from, please resist posting. - December 7th 2010, 08:46 PMDrexel28
- December 15th 2010, 08:56 PMDrexel28
Since no one seems interested I'll just give the answer for logical soundness:

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