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Exact Symbolic Reasoning for Nonlinear Stochastic SMT via Cylindrical Algebraic Decomposition

Authors: Jung-Cheng Lin, Chia-Hsuan Su, Jie-Hong R. Jiang, and Hiroshi Unno

Published in: LIPIcs, Volume 377, 29th International Conference on Theory and Applications of Satisfiability Testing (SAT 2026)


Abstract
Stochastic Satisfiability Modulo Theories (SSMT) has traditionally focused on the interplay between existential and randomized quantifiers, typically relying on numerical sampling or approximations. We present a generalized SSMT framework that integrates universal quantification, lifting the formalism to a robust stochastic game-theoretic setting. By treating universal quantifiers as the adversarial infimum of satisfaction probabilities, our framework enables the exact modeling of competitive interactions under uncertainty. Our approach leverages Cylindrical Algebraic Decomposition (CAD) to derive exact symbolic probability expressions for Nonlinear Real Arithmetic (NRA) formulas, moving beyond the limitations of linear constraints and point-value estimations. Central to our contribution is a recursive quantifier elimination algorithm designed to handle variable-dependent domains and non-algebraic expressions through a variable reparameterization technique. Experimental evaluation across baseline synthetic formulas, strategic economic models, and probabilistic program verification benchmarks demonstrates that our framework consistently computes exact symbolic solutions. By achieving a degree of symbolic precision and expressiveness unattainable by traditional numerical solvers, this work establishes a new baseline for exact reasoning in stochastic adversarial environments.

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Jung-Cheng Lin, Chia-Hsuan Su, Jie-Hong R. Jiang, and Hiroshi Unno. Exact Symbolic Reasoning for Nonlinear Stochastic SMT via Cylindrical Algebraic Decomposition. In 29th International Conference on Theory and Applications of Satisfiability Testing (SAT 2026). Leibniz International Proceedings in Informatics (LIPIcs), Volume 377, pp. 24:1-24:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2026)


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@InProceedings{lin_et_al:LIPIcs.SAT.2026.24,
  author =	{Lin, Jung-Cheng and Su, Chia-Hsuan and Jiang, Jie-Hong R. and Unno, Hiroshi},
  title =	{{Exact Symbolic Reasoning for Nonlinear Stochastic SMT via Cylindrical Algebraic Decomposition}},
  booktitle =	{29th International Conference on Theory and Applications of Satisfiability Testing (SAT 2026)},
  pages =	{24:1--24:19},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-431-4},
  ISSN =	{1868-8969},
  year =	{2026},
  volume =	{377},
  editor =	{Ignatiev, Alexey and Szeider, Stefan},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.SAT.2026.24},
  URN =		{urn:nbn:de:0030-drops-263307},
  doi =		{10.4230/LIPIcs.SAT.2026.24},
  annote =	{Keywords: Stochastic Satisfiability Modulo Theories (SSMT), Cylindrical Algebraic Decomposition (CAD), Quantifier Elimination}
}
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