"Appell-Lerch sum" meaning in English

{
  "etymology_text": "First studied by Paul Émile Appell and Mathias Lerch.",
  "forms": [
    {
      "form": "Appell-Lerch sums",
      "tags": [
        "plural"
      ]
    }
  ],
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    {
      "args": {},
      "expansion": "Appell-Lerch sum (plural Appell-Lerch sums)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "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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            "Sciences",
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            "Fundamental"
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          "source": "w"
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      ],
      "glosses": [
        "A generalization of Lambert series with the form"
      ],
      "id": "en-Appell-Lerch_sum-en-noun-w6ExNZtz",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "generalization",
          "generalization"
        ],
        [
          "Lambert series",
          "Lambert series"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A generalization of Lambert series with the form"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "Appell-Lerch sum"
}

{
  "etymology_text": "First studied by Paul Émile Appell and Mathias Lerch.",
  "forms": [
    {
      "form": "Appell-Lerch sums",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Appell-Lerch sum (plural Appell-Lerch sums)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
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        "English lemmas",
        "English multiword terms",
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        "Pages with 1 entry",
        "Pages with entries",
        "en:Mathematics"
      ],
      "glosses": [
        "A generalization of Lambert series with the form"
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "generalization",
          "generalization"
        ],
        [
          "Lambert series",
          "Lambert series"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A generalization of Lambert series with the form"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "Appell-Lerch sum"
}