Exercise 4. Suppose V is finite-dimensional. Let U, W be two subspaces of V. (a) Show that is isomorphic to (V/U) × (V/W) if and only if dim V = dim U +dim W.

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Exercise 4. Suppose V is finite-dimensional. Let U, W be two subspaces of V.
(a) Show that V is isomorphic to (V/U) x (V/W) if and only if dim V = dim U +dim W.
(b) Assume that V = U + W, show that V is isomorphic to (V/U) × (V/W) if and only
if V = U e W.
(c) Let T: V → (V/U) x (V/W) be defined by
T(1) = (r+ U,x +W).
Show that T is an isomorphism if and only if V = U @ W.
Transcribed Image Text:Exercise 4. Suppose V is finite-dimensional. Let U, W be two subspaces of V. (a) Show that V is isomorphic to (V/U) x (V/W) if and only if dim V = dim U +dim W. (b) Assume that V = U + W, show that V is isomorphic to (V/U) × (V/W) if and only if V = U e W. (c) Let T: V → (V/U) x (V/W) be defined by T(1) = (r+ U,x +W). Show that T is an isomorphism if and only if V = U @ W.
Expert Solution
Step 1

By theorem,

1. Two finite- dimensional vector space are isomorphic to each other if and only if their dimension are same.

2. In product space dim(M×N) =dim(M) +dim (N),  where M and N are vector space.

3. dim(M/N) = dim(M)-dim(N)

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