"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"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Caccioppoli set (plural Caccioppoli sets)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
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          "parents": [
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mathematics",
          "orig": "en:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "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",
        "English entries with language name categories using raw markup",
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        "English multiword terms",
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        "English terms with non-redundant non-automated sortkeys",
        "en:Mathematics"
      ],
      "glosses": [
        "A set whose boundary is measurable and has (at least locally) finite measure."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "boundary",
          "boundary"
        ],
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          "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"
}