"Margulis lemma" meaning in English

{
  "etymology_text": "Named after Grigory Margulis.",
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  "lang_code": "en",
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        "A result about discrete subgroups of isometries of a non-positively curved Riemannian manifold."
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          "isometries",
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          "Riemannian manifold",
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      "qualifier": "differential geometry",
      "raw_glosses": [
        "(differential geometry) A result about discrete subgroups of isometries of a non-positively curved Riemannian manifold."
      ],
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        "Grigory Margulis"
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  "word": "Margulis lemma"
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{
  "etymology_text": "Named after Grigory Margulis.",
  "forms": [
    {
      "form": "the Margulis lemma",
      "tags": [
        "canonical"
      ]
    }
  ],
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  "lang_code": "en",
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      "glosses": [
        "A result about discrete subgroups of isometries of a non-positively curved Riemannian manifold."
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          "differential geometry",
          "differential geometry"
        ],
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          "discrete"
        ],
        [
          "subgroup",
          "subgroup"
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          "isometries",
          "isometry"
        ],
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          "Riemannian manifold",
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        ]
      ],
      "qualifier": "differential geometry",
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        "(differential geometry) A result about discrete subgroups of isometries of a non-positively curved Riemannian manifold."
      ],
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        "Grigory Margulis"
      ]
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  "word": "Margulis lemma"
}