"Caccioppoli set" meaning in English

{
  "etymology_text": "The concept was introduced by the Italian mathematician Renato Caccioppoli in a paper in 1927.",
  "forms": [
    {
      "form": "Caccioppoli sets",
      "tags": [
        "plural"
      ]
    }
  ],
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    {
      "args": {},
      "expansion": "Caccioppoli set (plural Caccioppoli sets)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
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          "orig": "en:Mathematics",
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            "Fundamental"
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          "source": "w"
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      ],
      "glosses": [
        "A set whose boundary is measurable and has (at least locally) finite measure."
      ],
      "id": "en-Caccioppoli_set-en-noun-ngZm9F4j",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "boundary",
          "boundary"
        ],
        [
          "measurable",
          "measurable"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A set whose boundary is measurable and has (at least locally) finite measure."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Caccioppoli set"
      ]
    }
  ],
  "word": "Caccioppoli set"
}

{
  "etymology_text": "The concept was introduced by the Italian mathematician Renato Caccioppoli in a paper in 1927.",
  "forms": [
    {
      "form": "Caccioppoli sets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Caccioppoli set (plural Caccioppoli sets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
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        "English lemmas",
        "English multiword terms",
        "English nouns",
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      ],
      "glosses": [
        "A set whose boundary is measurable and has (at least locally) finite measure."
      ],
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          "boundary",
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      ],
      "raw_glosses": [
        "(mathematics) A set whose boundary is measurable and has (at least locally) finite measure."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Caccioppoli set"
      ]
    }
  ],
  "word": "Caccioppoli set"
}