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Analysis on the decidability of the almost-universality problem for higher-order languages

Research Project

Project/Area Number 19K14582
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 12030:Basic mathematics-related
Research InstitutionAkita University

Principal Investigator

Ryoma Sin'ya  秋田大学, 理工学研究科, 助教 (00807026)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Keywords形式言語 / オートマトン / 測度論 / 決定可能性 / 形式言語理論 / 正規言語 / 文脈自由言語 / 密度 / 可測性 / 概普遍性 / 制約オートマトン / 有限モデル理論 / 高階言語 / 概普遍性判定問題
Outline of Research at the Start

高階言語はプログラムの正しさを検証する「モデル検査」と呼ばれる技術を中心に近年注目を集めている言語クラスであるが,未解明な基本的性質が多く残されている重要な研究対象である.
本研究では高階言語に対する概普遍性判定問題と呼ばれる決定問題の決定可能性に着目し研究を進め,高階言語の母関数的・組合せ的性質の解明のへ新たな道を拓くことを目指す.

Outline of Final Research Achievements

The density of a language L is a real value between 0 and 1 that represents the “size” of L. The almost universality problem asks whether a given language is 1 or not.
In conducting our survey of context-free languages, we decided to focus on “weaker” subclasses of regular languages since the theory of density of context-free languages is not well-developed yet.
As a result, we discovered the notion of "measurability”, a decision problem about density, and obtained a series of new results on the density and measurability on formal languages were obtained throughout the period.

Academic Significance and Societal Importance of the Research Achievements

形式言語・オートマトン理論は1960年代から深く研究されており,現代の理論計算機科学の基礎をなしている分野である.
本研究で得られた密度や可測性に関する一連の成果は,形式言語理論に測度論的な新たな視点を与える全く新しい成果である.また,正規言語よりも「弱い」言語クラスにおける可測性の決定可能性は,正規言語の「近似理論」への応用などの新たな可能性を開いた.

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (22 results)

All 2023 2022 2021 2020 2019

All Journal Article (6 results) (of which Peer Reviewed: 4 results) Presentation (16 results) (of which Int'l Joint Research: 6 results,  Invited: 2 results)

  • [Journal Article] 部分語の出現情報の検査のみで近似できる正規言語について2023

    • Author(s)
      新屋良磨, 山口勇太郎, 中村誠希
    • Journal Title

      コンピュータソフトウェア

      Volume: 40 Pages: 49-60

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Measuring Power of?Locally Testable Languages2022

    • Author(s)
      Sin’ya Ryoma
    • Journal Title

      Lecture Notes in Computer Science

      Volume: 13257 Pages: 274-285

    • DOI

      10.1007/978-3-031-05578-2_22

    • ISBN
      9783031055775, 9783031055782
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 部分語の出現情報の検査のみで近似できる正規言語について2022

    • Author(s)
      新屋 良磨, 山口 勇太郎, 中村 誠希
    • Journal Title

      第24回プログラミングおよびプログラミング言語ワークショップ(PPL 2022)予稿集

      Volume: 1

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Carathodory Extensions of Subclasses of Regular Languages2021

    • Author(s)
      Ryoma Sin’ya
    • Journal Title

      The proceedings of the 25th International Conference on Developments in Language Theory (DLT2021) , LNCS

      Volume: 12811 Pages: 355-367

    • DOI

      10.1007/978-3-030-81508-0_29

    • ISBN
      9783030815073, 9783030815080
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Asymptotic Approximation by Regular Languages2021

    • Author(s)
      Sin’ya Ryoma
    • Journal Title

      SOFSEM 2021: Theory and Practice of Computer Science

      Volume: 1 Pages: 74-88

    • DOI

      10.1007/978-3-030-67731-2_6

    • ISBN
      9783030677305, 9783030677312
    • Related Report
      2020 Research-status Report
  • [Journal Article] Context-Freeness of Word-MIX Languages2020

    • Author(s)
      Sin’Ya Ryoma
    • Journal Title

      DLT2020: Developments in Language Theory

      Volume: 1 Pages: 304-318

    • DOI

      10.1007/978-3-030-48516-0_23

    • ISBN
      9783030485153, 9783030485160
    • Related Report
      2020 Research-status Report 2019 Research-status Report
  • [Presentation] Measuring Power of Locally Testable Languages2022

    • Author(s)
      Sin'ya Ryoma
    • Organizer
      26th International Conference Developments in Language Theory
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 部分語の出現情報の検査のみで近似できる正規言語について2022

    • Author(s)
      新屋良磨
    • Organizer
      第24回プログラミングおよびプログラミング言語ワークショップ(PPL 2022)
    • Related Report
      2021 Research-status Report
  • [Presentation] 正規言語族の無限内部階層における分離問題および可測性について2022

    • Author(s)
      新屋良磨
    • Organizer
      日本数学会 2022 年会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Carathodory Extensions of Subclasses of Regular Languages2021

    • Author(s)
      Ryoma Sin'ya
    • Organizer
      Developments in Language Theory
    • Related Report
      2021 Research-status Report
  • [Presentation] Asymptotic Approximation by Regular Languages2021

    • Author(s)
      Ryoma Sin'ya
    • Organizer
      SOFSEM 2021: Theory and Practice of Computer Science
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Asymptotic Approximation by Regular Languages2021

    • Author(s)
      Ryoma Sin'ya
    • Organizer
      Logic, Algebraic system, Language and Related Areas in Computer Science
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 正則言語で極限的に近似可能な言語について2021

    • Author(s)
      新屋良磨
    • Organizer
      第23回プログラミングおよびプログラミング言語ワークショップ
    • Related Report
      2020 Research-status Report
  • [Presentation] Measure theoretic approach to formal language theory2021

    • Author(s)
      Ryoma Sin'ya
    • Organizer
      日露二国間交流ワークショップ 実効記述集合論,計算可能解析学およびオートマトン理論
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Automata with Three Types of Constraints2020

    • Author(s)
      新屋良磨
    • Organizer
      情報処理学会プログラミング研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] 正則可測性:正則言語による極限的な近似可能性2020

    • Author(s)
      新屋良磨
    • Organizer
      代数, 論理, 幾何と情報科学研究集会
    • Related Report
      2020 Research-status Report
  • [Presentation] 算術で強化したオートマトンと言語の有理性・代数性2020

    • Author(s)
      新屋良磨
    • Organizer
      モデル理論夏の学校
    • Related Report
      2020 Research-status Report
  • [Presentation] Asymptotic Approximation by Regular Languages2020

    • Author(s)
      Ryoma Sin'ya
    • Organizer
      Online Worldwide Seminar on Logic and Semantics
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] A quantitative approach to the primitive words conjecture2020

    • Author(s)
      Ryoma Sin'ya
    • Organizer
      Computational Logic and Applications
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 原始語予想 -- a survey2020

    • Author(s)
      新屋良磨
    • Organizer
      記号論理と情報科学 研究集会
    • Related Report
      2020 Research-status Report
  • [Presentation] On the Context-Freeness of Word-MIX languages2020

    • Author(s)
      Ryoma Sin'ya
    • Organizer
      代数系、論理、言語と計算機科学の周辺II
    • Related Report
      2019 Research-status Report
  • [Presentation] Context-Freeness for Word-MIX Languages2019

    • Author(s)
      新屋良磨
    • Organizer
      情報処理学会プログラミング研究会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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