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Documents authored by Yang, Fan

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Yang, Fan

Document
DOI: 10.4230/DagRep.14.3.31
Logics for Dependence and Independence: Expressivity and Complexity (Dagstuhl Seminar 24111)

Authors: Juha Kontinen, Jonni Virtema, Heribert Vollmer, Fan Yang, and Nicolas Fröhlich

Published in: Dagstuhl Reports, Volume 14, Issue 3 (2024)

Abstract
This report documents the programme and outcomes of Dagstuhl Seminar "Logics for Dependence and Independence: Expressivity and Complexity" (24111). This seminar served as a follow-up seminar to the highly successful seminars "Dependence Logic: Theory and Applications" (13071), "Logics for Dependence and Independence" (15261) and "Logics for Dependence and Independence" (19031). A key objective of the seminar was to bring together researchers working in dependence logic and in application areas (for this edition with a particular emphasis on the areas of hyperproperties and formal linguistics), so that they can communicate state-of-the-art advances and embark on a systematic interaction. The goal was especially to reach those researchers who have recently started working in this thriving area, as well as researchers working on several aspects of complexity studies of team-based logics as well as expressivity issues, in particular in the just mentioned application areas. In particular, bringing together researchers from areas of theoretical studies with the application areas aimed at enhancing the synergy between the different communities working on dependence logic.
Cite as

Juha Kontinen, Jonni Virtema, Heribert Vollmer, Fan Yang, and Nicolas Fröhlich. Logics for Dependence and Independence: Expressivity and Complexity (Dagstuhl Seminar 24111). In Dagstuhl Reports, Volume 14, Issue 3, pp. 31-51, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2024)

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@Article{kontinen_et_al:DagRep.14.3.31,
  author =	{Kontinen, Juha and Virtema, Jonni and Vollmer, Heribert and Yang, Fan and Fr\"{o}hlich, Nicolas},
  title =	{{Logics for Dependence and Independence: Expressivity and Complexity (Dagstuhl Seminar 24111)}},
  pages =	{31--51},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2024},
  volume =	{14},
  number =	{3},
  editor =	{Kontinen, Juha and Virtema, Jonni and Vollmer, Heribert and Yang, Fan and Fr\"{o}hlich, Nicolas},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.14.3.31},
  URN =		{urn:nbn:de:0030-drops-211827},
  doi =		{10.4230/DagRep.14.3.31},
  annote =	{Keywords: finite model theory, formal linguistics, hyperproperties, information theory, team semantics}
}
Document
DOI: 10.4230/LIPIcs.FSTTCS.2021.52
Linear-Time Temporal Logic with Team Semantics: Expressivity and Complexity

Authors: Jonni Virtema, Jana Hofmann, Bernd Finkbeiner, Juha Kontinen, and Fan Yang

Published in: LIPIcs, Volume 213, 41st IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2021)

Abstract
We study the expressivity and complexity of model checking of linear temporal logic with team semantics (TeamLTL). TeamLTL, despite being a purely modal logic, is capable of defining hyperproperties, i.e., properties which relate multiple execution traces. TeamLTL has been introduced quite recently and only few results are known regarding its expressivity and its model checking problem. We relate the expressivity of TeamLTL to logics for hyperproperties obtained by extending LTL with trace and propositional quantifiers (HyperLTL and HyperQPTL). By doing so, we obtain a number of model checking results for TeamLTL and identify its undecidability frontier. In particular, we show decidability of model checking of the so-called left-flat fragment of any downward closed TeamLTL -extension. Moreover, we establish that the model checking problem of TeamLTL with Boolean disjunction and inclusion atoms is undecidable.
Cite as

Jonni Virtema, Jana Hofmann, Bernd Finkbeiner, Juha Kontinen, and Fan Yang. Linear-Time Temporal Logic with Team Semantics: Expressivity and Complexity. In 41st IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 213, pp. 52:1-52:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{virtema_et_al:LIPIcs.FSTTCS.2021.52,
  author =	{Virtema, Jonni and Hofmann, Jana and Finkbeiner, Bernd and Kontinen, Juha and Yang, Fan},
  title =	{{Linear-Time Temporal Logic with Team Semantics: Expressivity and Complexity}},
  booktitle =	{41st IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2021)},
  pages =	{52:1--52:17},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-215-0},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{213},
  editor =	{Boja\'{n}czyk, Miko{\l}aj and Chekuri, Chandra},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.FSTTCS.2021.52},
  URN =		{urn:nbn:de:0030-drops-155634},
  doi =		{10.4230/LIPIcs.FSTTCS.2021.52},
  annote =	{Keywords: Linear temporal logic, Hyperproperties, Model Checking, Expressivity}
}
Document
DOI: 10.4230/LIPIcs.MFCS.2019.19
Counting of Teams in First-Order Team Logics

Authors: Anselm Haak, Juha Kontinen, Fabian Müller, Heribert Vollmer, and Fan Yang

Published in: LIPIcs, Volume 138, 44th International Symposium on Mathematical Foundations of Computer Science (MFCS 2019)

Abstract
We study descriptive complexity of counting complexity classes in the range from #P to #*NP. A corollary of Fagin’s characterization of NP by existential second-order logic is that #P can be logically described as the class of functions counting satisfying assignments to free relation variables in first-order formulae. In this paper we extend this study to classes beyond #P and extensions of first-order logic with team semantics. These team-based logics are closely related to existential second-order logic and its fragments, hence our results also shed light on the complexity of counting for extensions of first-order logic in Tarski’s semantics. Our results show that the class #*NP can be logically characterized by independence logic and existential second-order logic, whereas dependence logic and inclusion logic give rise to subclasses of #*NP and #P, respectively. We also study the function class generated by inclusion logic and relate it to the complexity class TotP, which is a subclass of #P. Our main technical result shows that the problem of counting satisfying assignments for monotone Boolean Sigma_1-formulae is #*NP-complete with respect to Turing reductions as well as complete for the function class generated by dependence logic with respect to first-order reductions.
Cite as

Anselm Haak, Juha Kontinen, Fabian Müller, Heribert Vollmer, and Fan Yang. Counting of Teams in First-Order Team Logics. In 44th International Symposium on Mathematical Foundations of Computer Science (MFCS 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 138, pp. 19:1-19:15, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@InProceedings{haak_et_al:LIPIcs.MFCS.2019.19,
  author =	{Haak, Anselm and Kontinen, Juha and M\"{u}ller, Fabian and Vollmer, Heribert and Yang, Fan},
  title =	{{Counting of Teams in First-Order Team Logics}},
  booktitle =	{44th International Symposium on Mathematical Foundations of Computer Science (MFCS 2019)},
  pages =	{19:1--19:15},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-117-7},
  ISSN =	{1868-8969},
  year =	{2019},
  volume =	{138},
  editor =	{Rossmanith, Peter and Heggernes, Pinar and Katoen, Joost-Pieter},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.MFCS.2019.19},
  URN =		{urn:nbn:de:0030-drops-109634},
  doi =		{10.4230/LIPIcs.MFCS.2019.19},
  annote =	{Keywords: team-based logics, counting classes, finite model theory, descriptive complexity}
}

Yang, Fangkai

Document
DOI: 10.4230/LIPIcs.ICLP.2012.404
Extending C+ with Composite Actions for Robotic Task Planning

Authors: Xiaoping Chen, Guoqiang Jin, and Fangkai Yang

Published in: LIPIcs, Volume 17, Technical Communications of the 28th International Conference on Logic Programming (ICLP'12) (2012)

Abstract
This paper extends action language C+ by introducing composite actions as sequential execution of other actions, leading to a more intuitive and flexible way to represent action domains, better exploit a general-purpose formalization, and improve the reasoning efficiency for large domains. Our experiments show that the composite actions can be seen as a method of knowledge acquisition for intelligent robots.
Cite as

Xiaoping Chen, Guoqiang Jin, and Fangkai Yang. Extending C+ with Composite Actions for Robotic Task Planning. In Technical Communications of the 28th International Conference on Logic Programming (ICLP'12). Leibniz International Proceedings in Informatics (LIPIcs), Volume 17, pp. 404-414, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2012)

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@InProceedings{chen_et_al:LIPIcs.ICLP.2012.404,
  author =	{Chen, Xiaoping and Jin, Guoqiang and Yang, Fangkai},
  title =	{{Extending C+ with Composite Actions for Robotic Task Planning}},
  booktitle =	{Technical Communications of the 28th International Conference on Logic Programming (ICLP'12)},
  pages =	{404--414},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-43-9},
  ISSN =	{1868-8969},
  year =	{2012},
  volume =	{17},
  editor =	{Dovier, Agostino and Santos Costa, V{\'\i}tor},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ICLP.2012.404},
  URN =		{urn:nbn:de:0030-drops-36404},
  doi =		{10.4230/LIPIcs.ICLP.2012.404},
  annote =	{Keywords: Reasoning about Actions, Action Languages, Robotic Task Planning}
}
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