"Sprague-Grundy theorem" meaning in English

{
  "etymology_text": "The theorem and its proof encapsulate the main results of a theory discovered independently by R. P. Sprague (1935) and P. M. Grundy (1939).",
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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      "glosses": [
        "A theorem stating that every impartial game under the normal play convention is equivalent to a nimber."
      ],
      "id": "en-Sprague-Grundy_theorem-en-name-RstbFId-",
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          "game"
        ],
        [
          "nimber",
          "nimber"
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      ],
      "qualifier": "combinatorial game theory",
      "raw_glosses": [
        "(combinatorial game theory) A theorem stating that every impartial game under the normal play convention is equivalent to a nimber."
      ],
      "wikipedia": [
        "Sprague-Grundy theorem"
      ]
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  "word": "Sprague-Grundy theorem"
}

{
  "etymology_text": "The theorem and its proof encapsulate the main results of a theory discovered independently by R. P. Sprague (1935) and P. M. Grundy (1939).",
  "forms": [
    {
      "form": "the Sprague-Grundy theorem",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
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        "def": "1"
      },
      "expansion": "the Sprague-Grundy theorem",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
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        "English entries with language name categories using raw markup",
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      "glosses": [
        "A theorem stating that every impartial game under the normal play convention is equivalent to a nimber."
      ],
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          "impartial",
          "impartial"
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          "game"
        ],
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        ]
      ],
      "qualifier": "combinatorial game theory",
      "raw_glosses": [
        "(combinatorial game theory) A theorem stating that every impartial game under the normal play convention is equivalent to a nimber."
      ],
      "wikipedia": [
        "Sprague-Grundy theorem"
      ]
    }
  ],
  "word": "Sprague-Grundy theorem"
}