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bcjochim07
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Homework Statement
a) Prove that if u1, ... um are vectors in Rn , S = {u1,u2,...uk} and T = {u1,...uk, uk+1,...um} then span(S) [tex]\subseteq[/tex]span(T).
b) deduce also that if Rn = span(S), then Rn=span(T)
Homework Equations
The Attempt at a Solution
I think I got part a:
the span S is represented by linear combination c1u1 + c2u2 + ... ckuk
and the span T is represented by the linear combination
c1u1 + c2u2 + ... ckuk +... cmum
and since span(S) is contained in span(T)
span(S)[tex]\subseteq[/tex]span(T)
Does this look alright?
b) part b is giving me trouble
since span(S) = Rn, the entire set of linear combinations of the vectors {u1,u2,...uk} in set S forms a plane.
since span(S) is a subset of (T) which spans Rn,
span(T) = Rn.
I don't feel like this right at all, and I really can't visualize in my head what's going on here. Could somebody please help me? Thanks.