L04 Intersection and Union of Subspaces

Intersection of two subspaces is a subspace but union of two subspaces need not be a subspace of vector space.

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For more details, refer following books
1. S.H. Friedberg, A.J. Insel, L.E. Spence, Linear Algebra, Pearson Prentice Hall.
2. Kenneth Hoffman, Ray Kunze, Linear Algebra, Pearson Prentice Hall.