→ rf0914:你是不會做還是覺得答案錯? 05/18 23:34
→ keyuan:明天考試要考 臨時抱佛腳 05/18 23:58
Determine whether the following are subspaces of Ｒ^2Ｘ2
a The set of all 2 X 2 diagonal matrices .
b The set of all 2 X 2 triangular matrices
c The set of all 2 X 2 lower triangular matrices
d The set of all 2 X 2 matrices A such that a12 = 1
e The set of all 2 X 2 matrices B such that b11 = 0
f The set of all symmetric 2 X 2 matrices
g The set of all singular 2 X 2 matrices
Ans : acef
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