"Hartley function" meaning in English

{
  "etymology_text": "Introduced by Ralph Hartley in 1928.",
  "forms": [
    {
      "form": "the Hartley function",
      "tags": [
        "canonical"
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      "expansion": "the Hartley function",
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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          "kind": "other",
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      "glosses": [
        "A measure of uncertainty. If a sample from a finite set A uniformly at random is picked, the information revealed after the outcome is known is given by the Hartley function H_0(A):=log_b|A|, where |A| denotes the cardinality of A."
      ],
      "id": "en-Hartley_function-en-name-p11CRGBs",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "measure",
          "measure"
        ],
        [
          "uncertainty",
          "uncertainty"
        ],
        [
          "sample",
          "sample"
        ],
        [
          "finite",
          "finite"
        ],
        [
          "set",
          "set"
        ],
        [
          "information",
          "information"
        ],
        [
          "cardinality",
          "cardinality"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A measure of uncertainty. If a sample from a finite set A uniformly at random is picked, the information revealed after the outcome is known is given by the Hartley function H_0(A):=log_b|A|, where |A| denotes the cardinality of A."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Ralph Hartley"
      ]
    }
  ],
  "word": "Hartley function"
}

{
  "etymology_text": "Introduced by Ralph Hartley in 1928.",
  "forms": [
    {
      "form": "the Hartley function",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
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        "def": "1"
      },
      "expansion": "the Hartley function",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
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        "English entries with incorrect language header",
        "English eponyms",
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        "English proper nouns",
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        "en:Mathematics"
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      "glosses": [
        "A measure of uncertainty. If a sample from a finite set A uniformly at random is picked, the information revealed after the outcome is known is given by the Hartley function H_0(A):=log_b|A|, where |A| denotes the cardinality of A."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "measure",
          "measure"
        ],
        [
          "uncertainty",
          "uncertainty"
        ],
        [
          "sample",
          "sample"
        ],
        [
          "finite",
          "finite"
        ],
        [
          "set",
          "set"
        ],
        [
          "information",
          "information"
        ],
        [
          "cardinality",
          "cardinality"
        ]
      ],
      "raw_glosses": [
        "(mathematics) A measure of uncertainty. If a sample from a finite set A uniformly at random is picked, the information revealed after the outcome is known is given by the Hartley function H_0(A):=log_b|A|, where |A| denotes the cardinality of A."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Ralph Hartley"
      ]
    }
  ],
  "word": "Hartley function"
}