MIT Linear Algebra, Lecture 5: Vector Spaces and Subspaces

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January 21, 2010, 19:18

Nate, because multiplying an element in Z^2 by a fractional scalar brings it outside Z^2. For example, element (1, 2) is in Z^2 but 0.5*(1, 2) = (0.5, 1) is not.

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