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How is this M(2,2)->R closed under addition?

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2 so I understand that It is closed under scalar multiplication, but how is it closed under addition? what if I add another matrix to A? and create new a,b,c,d values? linear-algebra share | cite | improve this question asked Dec 17 at 23:39 isuckatprogramming 25 6 1 "Closed under addition" is not quite the right phrase here. We use the properties of being closed unde...