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Topological tensor product : ウィキペディア英語版
Topological tensor product
In mathematics, there are usually many different ways to construct a topological tensor product of two topological vector spaces. For Hilbert spaces or nuclear spaces there is a simple well-behaved theory of tensor products (see Tensor product of Hilbert spaces), but for general Banach spaces or locally convex topological vector spaces the theory is notoriously subtle.
==Tensor products of Hilbert spaces==
:(詳細はsesquilinear form (scalar product) induced by the sesquilinear forms of ''A'' and ''B''. So in particular it has a natural positive definite quadratic form, and the corresponding completion is a Hilbert space ''A''⊗''B'', called the (Hilbert space) tensor product of ''A'' and ''B''.
If the vectors ''ai'' and ''bj'' run through orthonormal bases of ''A'' and ''B'', then the vectors ''ai''⊗''bj'' form an orthonormal basis of ''A''⊗''B''.

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