"Donaldson-Thomas invariant" meaning in English

{
  "etymology_text": "Introduced in 1998 by Simon Donaldson and Richard Thomas.",
  "forms": [
    {
      "form": "Donaldson-Thomas invariants",
      "tags": [
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "Given a compact moduli space of sheaves on a Calabi-Yau threefold, its Donaldson-Thomas invariant is the virtual number of its points, i.e., the integral of the cohomology class 1 against the virtual fundamental class."
      ],
      "id": "en-Donaldson-Thomas_invariant-en-noun-OdNn1VFQ",
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      "raw_glosses": [
        "(algebraic geometry) Given a compact moduli space of sheaves on a Calabi-Yau threefold, its Donaldson-Thomas invariant is the virtual number of its points, i.e., the integral of the cohomology class 1 against the virtual fundamental class."
      ],
      "related": [
        {
          "word": "Donaldson-Thomas theory"
        }
      ],
      "topics": [
        "algebraic-geometry",
        "geometry",
        "mathematics",
        "sciences"
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    }
  ],
  "word": "Donaldson-Thomas invariant"
}

{
  "etymology_text": "Introduced in 1998 by Simon Donaldson and Richard Thomas.",
  "forms": [
    {
      "form": "Donaldson-Thomas invariants",
      "tags": [
        "plural"
      ]
    }
  ],
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  "lang_code": "en",
  "pos": "noun",
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    {
      "word": "Donaldson-Thomas theory"
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      "glosses": [
        "Given a compact moduli space of sheaves on a Calabi-Yau threefold, its Donaldson-Thomas invariant is the virtual number of its points, i.e., the integral of the cohomology class 1 against the virtual fundamental class."
      ],
      "links": [
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          "algebraic geometry",
          "algebraic geometry"
        ],
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          "Calabi-Yau manifold#English"
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      "raw_glosses": [
        "(algebraic geometry) Given a compact moduli space of sheaves on a Calabi-Yau threefold, its Donaldson-Thomas invariant is the virtual number of its points, i.e., the integral of the cohomology class 1 against the virtual fundamental class."
      ],
      "topics": [
        "algebraic-geometry",
        "geometry",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "Donaldson-Thomas invariant"
}