One of the proofs below, however, will have some similarity to this argument, by introducing a matrix with non-numeric coefficients in which A can really live inside an entry, but then A I_n is not equal to A, and the conclusion is reached differently.
One of the proofs below will have some similarity to this argument. This is by. This is however. One of the proofs below were introducing a matrix with non-numeric coefficients in which A can really live inside an entry. This was however. Then A I_n is not equal to A. This was however. The conclusion is reached differently. This was however.