"covering number" meaning in English

{
  "forms": [
    {
      "form": "covering numbers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "covering number (plural covering numbers)",
      "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",
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          "source": "w"
        },
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          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
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          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Graph theory",
          "orig": "en:Graph theory",
          "parents": [
            "Mathematics",
            "Visualization",
            "Formal sciences",
            "Computing",
            "Interdisciplinary fields",
            "Sciences",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The number of vertices in a minimum vertex cover of a graph, often denoted as τ=τ(G)."
      ],
      "id": "en-covering_number-en-noun-5ijGZZvg",
      "links": [
        [
          "graph theory",
          "graph theory"
        ],
        [
          "vertex cover",
          "vertex cover"
        ]
      ],
      "raw_glosses": [
        "(graph theory) The number of vertices in a minimum vertex cover of a graph, often denoted as τ=τ(G)."
      ],
      "related": [
        {
          "word": "edge covering number"
        }
      ],
      "topics": [
        "graph-theory",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "covering number"
}

{
  "forms": [
    {
      "form": "covering numbers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "covering number (plural covering numbers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "edge covering number"
    }
  ],
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "Pages with entries",
        "en:Graph theory"
      ],
      "glosses": [
        "The number of vertices in a minimum vertex cover of a graph, often denoted as τ=τ(G)."
      ],
      "links": [
        [
          "graph theory",
          "graph theory"
        ],
        [
          "vertex cover",
          "vertex cover"
        ]
      ],
      "raw_glosses": [
        "(graph theory) The number of vertices in a minimum vertex cover of a graph, often denoted as τ=τ(G)."
      ],
      "topics": [
        "graph-theory",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "covering number"
}