Mathematical Sciences Classification System
46Cxx - Inner product spaces and their generalizations, Hilbert spaces
{For function spaces, see 46Exx}
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46C05Hilbert and pre-Hilbert spaces: geometry and topology (including spaces with semidefinite inner product)
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46C07
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46C15Characterizations of Hilbert spaces
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46C20Spaces with indefinite inner product (Kreĭn spaces, Pontryagin spaces, etc.) [See also 47B50]
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46C50Generalizations of inner products (semi-inner products, partial inner products, etc.)
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46C99None of the above, but in this section