The trace of a square 1 x n matrix A = (a) is the sum a1 + a22+...+ of the entries on its main diagonal. Let V be the vector space of all 2 x 2 matrices with real entries. Let H be the set of all 2 x 2 matrices with real entries that have trace 1. Is H a subspace of the vector space V? 1. Does H contain the zero vector of V? H does not contain the zero vector of V 2. Is H closed under addition? If it is, enter CLOSED. If it is not, enter two matrices in H whose sum is not in H, using a comma separated list and syntax such as [[1,2], [3,4]], [[5,6], [7,8]] for the answer 2] 5 6 [34] 78 that A + B has trace not equal to one.) 7 (Hint: to show that I is not closed under addition, it is sufficient to find two trace one matrices A and B such 3. Is H closed under scalar multiplication? If it is, enter CLOSED. If it is not, enter a scalar in R and a matrix in HI whose product is not in H, using a comma separated list and syntax such (Hint: to show that I is not closed under scalar multiplication, it is sufficient to find a real number and a trace one matrix A such 3 as 2, [[3,4], [5,6]] for the answer 2, that rA has trace not equal to one.) 4. Is H a subspace of the vector space V? You should be able to justify your answer by writing a complete, coherent, and detailed proof based on your answers to parts 1-3. choose

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