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Mathematics, 05.02.2020 13:44 Naysa150724
2. prove that if a and b are n x n matrices and ab is invertible, then both a and b are invertible. warning: you cannot use the formula (ab)^-1 = b^-1 a^-1, because we are trying to prove in the first place that a and b are invertible, so the inverse matrices on the right side of this equation are not known to exist
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2. prove that if a and b are n x n matrices and ab is invertible, then both a and b are invertible....
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