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1. The problem statement, all variables and given/known data

Let T : M_{22}define as T(A) = Tr(A). Show that T is a linear transformation

and find the dimension of ker T.

2. Relevant equations

3. The attempt at a solution

what is Tr(A)?

is it trace(A), or rT(A) , r is a real number?

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# Homework Help: Quick ! T(A) = Tr(A)

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