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When are maps preserving semi-inner products linear? - MaRDI portal

When are maps preserving semi-inner products linear? (Q2142584)

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When are maps preserving semi-inner products linear?
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    When are maps preserving semi-inner products linear? (English)
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    27 May 2022
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    functional equation
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    orthogonality equation
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    semi-inner product
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    uniformly smooth Banach space
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