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1.let W1 and W2 be subspaces of a vector space V having dime

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1.let W1 and W2 be subspaces of a vector space V having dimensions m and n,where m>=n.
(a)Prove that dim(W1交W2)
1.let W1 and W2 be subspaces of a vector space V having dime
(1)you have ignored an important formular:
dim(W1)+dim(W2)=dim(W1∩W2)+dim(W1+W2)
since
dim(W1+W2)≥m so dim(W1∩W2)≤n
and
dim(W1∩W2)≥1 so dim(W1+W2)