In the vector space R^3×3, consider the subspace U of all symmetric matrices, which are matrices equal to their transposes: U={A∈R^3×3∣A^T=A}. Then the dimension of the subspace U is: (a) 0. (b) 1. (c) 3. (d) 6. (e) 9.

Elementary Linear Algebra (MindTap Course List)
8th Edition
ISBN:9781305658004
Author:Ron Larson
Publisher:Ron Larson
Chapter4: Vector Spaces
Section4.5: Basis And Dimension
Problem 66E
Question

In the vector space R^3×3, consider the subspace U of all symmetric matrices, which are matrices equal to their transposes: U={A∈R^3×3∣A^T=A}. Then the dimension of the subspace U is:

(a) 0. (b) 1. (c) 3. (d) 6. (e) 9.

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