Determine which of the following subsets of R33 are subspacesof R33 by answering yes or no for
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Question:
Determine which of the following subsets of R3×3 are subspacesof R3×3 by answering yes or no for each of them.
1. The invertible 3×3 matric
2. The symmetric 3×3 matrices
3. The 3×3 matrices whose entries are allintegers
4. The upper triangular 3×3 matrices
5. The singular 3×3 matrices
6. The 3×3 matrices with trace 0 (the trace ofa matrix is the sum of its diagonal entries)
7. The 3×3 matrices in reduced row-echelonform
8. The 3×3 matrices with all zeros in the firstrow
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