Hi, i'm struggling with this question and really need a push in the right direction... i haven't the faintest idea of what to do here... we haven't learnt about transposing maxtrices yet, I just saw something about it in a text book so I have a vague idea, but I don't really know how to go about proving this:

If A is an m x n matrix with (i,j)- entry , let be the n x m matrix with (i,j)- entry . Show that if the product C= AB is defined, then so is , and that .

I'd really appreciate any help you guys could give me, cheers.

thanks in advance!

rorosingsong