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Is the union of two linear subspaces always a linear subspace?
From Mathematics Is A Science
Revision as of 23:29, 18 November 2010 by imported>WikiSysop
Question: Is the union of two linear subspaces always a linear subspace?
Answer: No.
Why: Consider the x-axis and the y-axis...
What about the intersection? the complement?
What if these questions are asked about groups?