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Physicsissuef
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Homework Statement
Are the vector subspaces U={(x,y,0,0) | x+2y=0} and W= {(0,0,z,t | z+t=0} from [tex]R^4[/tex] stand for U+W = [tex]R^4[/tex]
Homework Equations
The Attempt at a Solution
Can somebody explain, how will solve this task. I have no idea, how they do in my book.
Thanks.