No One-to-One Linear Transformation: V to W

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SUMMARY

The discussion centers on the proof that if V and W are finite-dimensional vector spaces with dim(W) < dim(V), then there cannot be a one-to-one linear transformation T: V → W. Participants emphasize the importance of understanding the definitions of dimension and one-to-one mappings in linear algebra. Concrete examples are suggested to illustrate the relationship between the dimensions of vector spaces and the existence of injective functions. The conclusion is that the dimensionality directly impacts the possibility of such transformations.

PREREQUISITES
  • Understanding of finite-dimensional vector spaces
  • Knowledge of linear transformations and their properties
  • Familiarity with the concept of dimension in linear algebra
  • Basic comprehension of one-to-one (injective) functions
NEXT STEPS
  • Study the definitions and properties of finite-dimensional vector spaces
  • Learn about linear transformations and their classifications
  • Explore examples of injective and non-injective mappings in linear algebra
  • Investigate the implications of dimension on linear transformations
USEFUL FOR

Students of linear algebra, educators teaching vector space concepts, and anyone seeking to understand the relationship between dimensions and linear transformations.

hannahlu92
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Homework Statement



Prove: If V and W are finite-dimensional vector spaces such that dim(W)<dim(V), then there is no one-to-one linear transformation T:V-->W




The Attempt at a Solution


I don't know how to do a well thought out proof.
 
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Hi hannahlu92! :smile:

The first thing you should do with such a statement is trying to find concrete examples. Can you find examples of V and W such that dim(V)<dim(W). Is it true that there doesn't exist such a one-to-one map for these examples? (I.e. is it inuitively true).

Then, to actually start proving it, you'll need to unwind the concept. What does dimension mean? What does one-to-one mean? Can we find some connection between the definition of dimension and the concept of one-to-one maps?
 


thank you for taking the time to try and help me. My final is tomorrow and I still can't understand Linear Algebra
 

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