"projective Hilbert space" meaning in English

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  "etymology_text": "From projective + Hilbert space.",
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        "The quotient of a Hilbert space by an equivalence relation which considers a pair of vectors equivalent iff they differ only by a factor which is a complex number."
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          "equivalence relation"
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          "iff",
          "iff"
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          "complex number",
          "complex number"
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  "word": "projective Hilbert space"
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  "etymology_text": "From projective + Hilbert space.",
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