# linear independent

linear independent

Let V and W be vector spaces and T: V –> W be linear. Suppose that T is one-to-one and that S is a subset of V. Prove that S is linearly independent if and only if T(S) is linearly independent.

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Relevant Theorems:
(1) T: V –> W is linear if T(x+y) = T(x) + T(y) and T(cx) = cT(x)
(2) nullspace (or kernel) N(T) = {x in V : T(x) = 0}
(3) range (or image) R(T) = {T(x) : x in V}
(4) Let V and W be vector spaces and T: V –> W be linear. Then N(T) and R(T) are subspaces of V and W respectively
(5) Let V and W be vector spaces and T: V –> W be linear. If B = {v1, v2, v3, …. , vn} is a basis for V, then
R(T) = span{ T(B) = span{ T(v1), T(v2), T(v3), ….. , T(vn) } }
(6) If N(T) and R(T) are finite-dimensional, then nullity(T) = dim[ N(T) ], and rank(T) = dim[ R(T) ]
(7) Dimension Theorem: Let V and W be vector spaces and T: V –> W be linear. If V is finite-dimensional, then
nullity(T) + rank(T) = dim(V)
(8) Let V and W be vector spaces, and let T: V –> W be linear. Then T is one-to-one if and only if N(T) = {0}, and T is onto if and only if dim{R(T)} = dim(W)
(9) Let V and W be vector spaces of equal (finite) dimension, and T: V –> W be linear. Then the following are equivalent:
(i) T is one-to-one
(ii) T is onto
(iii) rank(T) = dim(V)
(10) Let V and W be vector spaces over F, and suppose that {v1, v2, … , vn} is a basis for V. For w1, w2, … , wn in W, there exists exactly one linear transformation T: V –> W such that T(vi) = wi for i = 1, 2, … , n.
(11) Let V and W be vector spaces, and suppose that V has a finite basis {v1, v2, … , vn}. If U, T: V –> W are linear and U(vi) = T(vi) for i = 1, 2, … , n, then U = T

Note: I CANNOT use the following (a previous result): “T is one-to-one if and only if T carries linearly independent subsets of V onto linearly independent subsets of W”.

Min Pages: 1
Level of Detail: Show all work
Other Requirements: Recall, I cannot use the result that I stated at the bottom. I can use anything I gave you as well as anything that came in the sections prior about vector spaces, bases, and linear (in)dependence.

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