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Vectors & Spaceshard
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Let VVV be the vector space of 3×33 \times 33×3 matrices. Consider the subspace W={A∈V∣tr(A)=0}W = \{ A \in V \mid \text{tr}(A) = 0 \}W={A∈V∣tr(A)=0}. What is the dimension of the subspace S∩WS \cap WS∩W, where SSS is the space of symmetric 3×33 \times 33×3 matrices?