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- Thread starter kent davidge
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fresh_42

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Unitary means we have a complex (real) vector space with a complex (sesquilinear / real: bilinear) inner product, which is also called a pre-Hilbert space or inner product space. If it is of finite dimension, then we the inner product defines an isometric isomorphism on ##\mathbb{C}^n## (resp. ##\mathbb{R}^n\;##) which is complete.

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