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Mathematics 18 Online
OpenStudy (anonymous):

Linear Algebra : find a subset F of R^2 contains OR^2=(0,0) s.t F is not subspace.

OpenStudy (anonymous):

Pretty much anything that is not a line or the xy plane will work...

OpenStudy (anonymous):

give me an example

OpenStudy (anonymous):

Okay, let F be all (x, y) s.t. y <= 0. You can easily prove this is not a subspace, but it's a subset of R^2.

OpenStudy (anonymous):

got it tanks

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