46Cxx
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Inner product spaces and their generalizations, Hilbert spaces
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{For function spaces, see 46Exx}
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46C05 Hilbert and pre-Hilbert spaces: geometry and topology (including spaces with semidefinite inner product)
46C07 Hilbert subspaces (= operator ranges); complementation (Aronszajn, de Branges,...) [See 46B70, 46M35]
46C15 Characterizations of Hilbert spaces
46C20 Spaces with indefinite inner product (Krein spaces, Pontryagin spaces,...) [See also 47B50]
46C50 Generalizations of inner products (semi-inner products, partial inner products, etc.)
46C99 None of the above, but in this section
Version of December 15, 1998