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Homework Statement
Prove that V is a subspace of R^{4}
Actual problem is attached
Homework Equations
 S contains a zero element
 for any x in V and y in V, x + y is in V
 for any x in V and scalar k, kx is in V
The Attempt at a Solution
Its obvious that V is a subset of R^{4}. And I know I must prove that is it contains zero vector which is obvious. But how to I prove its closure, I can see that it is by looking but how exactly do I denote it?
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