Isomorphism of Hom_K(V,K) and Hom_K(V⊗V,K)

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SUMMARY

The isomorphism between Hom_{K}(V,K) ⊗ Hom_{K}(V,K) and Hom_{K}(V ⊗ V,K) is established through fundamental properties of tensor products in vector spaces over a field K. Specifically, the discussion highlights three key facts: (1) Hom(V,W) is naturally isomorphic to V* ⊗ W, (2) V ⊗ K is naturally isomorphic to V, and (3) (V ⊗ W)* is naturally isomorphic to V* ⊗ W*. These properties serve as the foundation for proving the isomorphism of the two tensor products.

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  • Familiarity with tensor products in linear algebra
  • Knowledge of dual spaces and their properties
  • Basic proficiency in Homomorphism concepts in vector spaces
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Mathematicians, students of linear algebra, and researchers interested in the properties of vector spaces and tensor products will benefit from this discussion.

antonio85
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Why these two tensor products are isomorphic?

[tex]Hom_{K}(V,K) \otimes Hom_{K}(V,K)[/tex] and [tex]Hom_{K}(V \otimes V,K)[/tex]

where K is a field and V is a vector space over K.
 
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This follows from the following elementary facts about tensors product that you should try to prove as easy exercices.

For V,W vectors spaces over K, and o the tensor product,

(1) Hom(V,W) is naturally isomorphic to V* o W
(2) V o K is naturally isomorphic to V
(3) (V o W)* is naturally isomorphic to V* o W*
 

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