Consider the subspaces S1={(r,0,t): r,t∈R} and S2={(s,s,0): s∈R} of R^3. Prove that S1⊕S2=R^3.

I am not sure how to show this at all, my teacher didn't give us any examples of this. Would really appreciate some help please.

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- Jul 14th 2011, 02:58 PMsteph3824Showing two subspaces are a direct sum
Consider the subspaces S1={(r,0,t): r,t∈R} and S2={(s,s,0): s∈R} of R^3. Prove that S1⊕S2=R^3.

I am not sure how to show this at all, my teacher didn't give us any examples of this. Would really appreciate some help please. - Jul 14th 2011, 03:46 PMAlso sprach ZarathustraRe: Showing two subspaces are a direct sum