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**Quick please! T(A) = Tr(A)**

## Homework Statement

Let T : M

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

and find the dimension of ker T.

## Homework Equations

## The Attempt at a Solution

what is Tr(A)?

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