Let V and W be finite-dimensional vector spaces and T: V →W be linear. (a) Prove that if dim(V) <dim(W), then T cannot be onto. (b) Prove that if dim(V) >dim(W), then T cannot be one-to-one.

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter6: Vector Spaces
Section6.3: Change Of Basis
Problem 21EQ
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Let V and W be finite-dimensional vector spaces and T: V →W be linear.

(a) Prove that if dim(V) <dim(W), then T cannot be onto.

(b) Prove that if dim(V) >dim(W), then T cannot be one-to-one.

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