"Siegel-Walfisz theorem" meaning in English

{
  "etymology_text": "Obtained by Arnold Walfisz as an application of a theorem by Carl Ludwig Siegel.",
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  "lang": "English",
  "lang_code": "en",
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      "glosses": [
        "A particular refinement of the prime number theorem and of Dirichlet's theorem on primes in arithmetic progressions."
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        "(mathematics) A particular refinement of the prime number theorem and of Dirichlet's theorem on primes in arithmetic progressions."
      ],
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        "mathematics",
        "sciences"
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  "word": "Siegel-Walfisz theorem"
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{
  "etymology_text": "Obtained by Arnold Walfisz as an application of a theorem by Carl Ludwig Siegel.",
  "forms": [
    {
      "form": "the Siegel-Walfisz theorem",
      "tags": [
        "canonical"
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    }
  ],
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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      "glosses": [
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        "(mathematics) A particular refinement of the prime number theorem and of Dirichlet's theorem on primes in arithmetic progressions."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
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        "Siegel-Walfisz theorem"
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}