If m≠n and we have the matrices A (m×n), B (n×m) and C (n×m) such that AB=I(m×m) and CA=I(n×n), does B=C?
I know the proof that it is true if we are talking about square matrices, but it doesn't help in this case.
I have injection f:A→B and I want to get bijection. Can I just resting codomain to f(A)? I know that every function i...
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