True or False. If the statement is true, prove it. Otherwise, give a counterexample.  1. Let A, B ∈ M_n(F). If nullity(A) = nullity(B) then A and B are similar. 2. The function L : M_n(F) → M_n(F) defined by L(A) = A − A^T is a linear transformation. 3. All nonzero linear transformations T : F^3 → F are onto.

Elementary Linear Algebra (MindTap Course List)
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Chapter6: Linear Transformations
Section6.1: Introduction To Linear Transformations
Problem 74E
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True or False. If the statement is true, prove it. Otherwise, give a counterexample. 

1. Let A, B ∈ M_n(F). If nullity(A) = nullity(B) then A and B are similar.

2. The function L : M_n(F) → M_n(F) defined by L(A) = A − A^T
is a linear transformation.

3. All nonzero linear transformations T : F^3 → F are onto.

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