Generally e A e B is different from e B e A . They are both different from e A+B . Check
Chapter 5, Problem 5.4.38(choose chapter or problem)
Generally e A e B is different from e B e A . They are both different from e A+B . Check this using 3637 and 34: A = " 1 1 0 0# B = " 0 1 0 0 # A+B = " 1 0 0 0#
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