Answer to Question #121534 in Abstract Algebra for Brain

Question #121534
Suppose T in L(V) and U is a subspace of V.
Prove that if U subset of null T, then U is invariant under T.
1
Expert's answer
2020-06-11T20:12:55-0400


Recall : A subspace W of a vector space V is called invariant under T iff T(W)"\\subset" W

Since U is given to be subspace of V so, 0 belongs to U

Now again U is subset of null space of V

Therefore , T(0)=0

For all u"\\in" U

We have T(u)=0 (because U is subset of null(T)

"\\forall" u"\\in" U , T(u)=0"\\in" U

So, T(U)"\\subset" U

Hence , U is invariant under T


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