The subring E[F] generated by E and F is a vector space over Kin the obvious way.

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The subring E[F] generated by E and F is a vector space over Kin the obvious way. The tensor product E ⊗K F is also a K-vector space . E and F are linearly disjoint over K if and only if the K-linear transformation E⊗K F → E[F] (given on generators of E⊗K F by a ⊗ b |→ ab) is an isomorphism.

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