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arxiv: 2605.09347 · v1 · submitted 2026-05-10 · 💻 cs.AI · cs.LO

Recognition: 2 theorem links

· Lean Theorem

Dsat: A Native SAT Solver for Discrete Logic

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Pith reviewed 2026-05-12 03:53 UTC · model grok-4.3

classification 💻 cs.AI cs.LO
keywords discrete logicSAT solverunit resolutionclause learningCSP solverbinarizationconjunctive normal formsymbolic reasoning
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The pith

A native SAT solver extends unit resolution and clause learning to operate directly on discrete variables.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper develops a SAT solver that works natively on discrete logic, where variables can take arbitrary values rather than being restricted to true or false. This avoids the standard practice of binarizing discrete variables into Boolean ones, which introduces both computational overhead and potential loss of semantic information in domains such as planning and probabilistic reasoning. The solver adapts core Boolean SAT techniques like unit resolution and clause learning to function directly on discrete domains while preserving a similar overall design. Empirical comparisons position the native solver against CSP solvers on discrete CNFs, Boolean SAT solvers on binarized CNFs, and hybrid approaches.

Core claim

We develop a native SAT solver for discrete logic, which is a direct extension of Boolean logic in which variables can take arbitrary values. Our proposed solver has a similar design to Boolean SAT solvers, with ingredients such as unit resolution and clause learning but ones that operate natively on discrete variables.

What carries the argument

Native unit resolution and clause learning that operate directly on discrete variables within CNF formulas.

Load-bearing premise

The native discrete versions of unit resolution and clause learning can be implemented efficiently enough to outperform CSP solvers on discrete CNFs and Boolean SAT solvers on binarized versions.

What would settle it

A set of discrete-logic benchmark problems on which the native solver is slower than both CSP solvers applied directly and Boolean SAT solvers applied to binarized versions would falsify the performance claim.

read the original abstract

Discrete variables are common in many applications, such as probabilistic reasoning, planning and explainable AI. When symbolic reasoning techniques are brought in to bear on these applications, a standard technique for handling discrete variables is to binarize them into Boolean variables to allow the use of Boolean computational machinery such as SAT solvers. This technique can face both computational and semantical challenges though. In this work, we develop a native SAT solver for discrete logic, which is a direct extension of Boolean logic in which variables can take arbitrary values. Our proposed solver has a similar design to Boolean SAT solvers, with ingredients such as unit resolution and clause learning but ones that operate natively on discrete variables. We illustrate the merits of the developed SAT solver by comparing it empirically to CSP solvers applied to discrete CNFs, to Boolean SAT solver applied to binarized CNFs, and to some hybrid solvers.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The paper introduces Dsat, a native SAT solver for discrete logic that directly extends Boolean SAT to variables taking values from arbitrary finite domains. It adapts core Boolean SAT techniques such as unit resolution and clause learning to operate natively on discrete variables rather than requiring binarization, and illustrates the approach via empirical comparisons against CSP solvers on discrete CNFs, Boolean SAT solvers on binarized CNFs, and hybrid solvers.

Significance. If the native discrete operations can be implemented with efficiency comparable to Boolean SAT (without hidden O(d) overheads for domain size d), the work could meaningfully advance symbolic reasoning in domains such as planning, probabilistic inference, and explainable AI by preserving semantics and avoiding binarization artifacts. The reuse of established SAT architecture (unit propagation, clause learning) is a clear strength that facilitates adoption.

major comments (2)
  1. [Abstract / Solver Design] Abstract and solver-design description: the central claim that native unit resolution and clause learning outperform both CSP solvers on discrete CNFs and Boolean SAT on binarized versions rests on the assumption that these operations incur no new semantic or computational overhead. No complexity analysis or data-structure details (e.g., representation of allowed value sets or generalization of watched literals) are supplied, leaving open the possibility that domain maintenance costs O(d) per step and negates the claimed advantage.
  2. [Empirical Evaluation] Empirical evaluation: the abstract states that merits are illustrated by comparisons, yet no concrete performance numbers, instance characteristics (domain sizes, number of variables), or statistical significance tests are referenced. Without these, the load-bearing claim of practical superiority cannot be assessed.
minor comments (2)
  1. [Abstract] Clarify in the abstract and introduction that 'arbitrary values' are restricted to finite discrete domains; the current phrasing risks misinterpretation.
  2. [Related Work] Ensure the related-work section explicitly positions the contribution relative to existing multi-valued SAT or generalized CSP solvers to avoid overlap claims.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the thoughtful and constructive report. We address each major comment below and describe the revisions we will undertake.

read point-by-point responses
  1. Referee: [Abstract / Solver Design] Abstract and solver-design description: the central claim that native unit resolution and clause learning outperform both CSP solvers on discrete CNFs and Boolean SAT on binarized versions rests on the assumption that these operations incur no new semantic or computational overhead. No complexity analysis or data-structure details (e.g., representation of allowed value sets or generalization of watched literals) are supplied, leaving open the possibility that domain maintenance costs O(d) per step and negates the claimed advantage.

    Authors: We agree that the abstract and the high-level solver-design description do not supply the requested complexity analysis or low-level data-structure details. This is a fair observation. In the revised manuscript we will add a dedicated subsection (placed after the current solver-design section) that (i) specifies the representation of allowed value sets, (ii) describes the generalization of watched literals to discrete domains, and (iii) provides a formal complexity argument showing that the core propagation and learning steps remain O(1) amortized per operation with no hidden linear dependence on domain size d. revision: yes

  2. Referee: [Empirical Evaluation] Empirical evaluation: the abstract states that merits are illustrated by comparisons, yet no concrete performance numbers, instance characteristics (domain sizes, number of variables), or statistical significance tests are referenced. Without these, the load-bearing claim of practical superiority cannot be assessed.

    Authors: We acknowledge that the abstract itself contains no numerical results or instance statistics. The full experimental section already reports runtime tables, domain sizes, variable counts, and the benchmark suite used. To improve accessibility we will (a) insert a short summary sentence with representative numbers into the abstract and (b) add an explicit statement on statistical significance testing in the evaluation section. revision: partial

Circularity Check

0 steps flagged

No significant circularity in the native discrete SAT solver design

full rationale

The paper presents the development of a native SAT solver for discrete logic as a direct algorithmic extension of Boolean SAT solvers, featuring unit resolution and clause learning adapted to operate on discrete variables rather than through binarization. This is framed as a design contribution whose merits are illustrated via empirical comparisons to CSP solvers, Boolean SAT on binarized instances, and hybrids. No load-bearing derivation chain, equations, fitted parameters renamed as predictions, or self-citations that reduce the central claims to prior inputs by construction are present. The approach relies on new native operations whose efficiency is an open empirical question, not a self-referential definition or imported uniqueness theorem.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on the assumption that discrete logic is a straightforward semantic extension of Boolean logic and that standard SAT ingredients can be lifted without new foundational axioms. No free parameters or invented entities are described in the abstract.

axioms (2)
  • domain assumption Discrete logic is a direct extension of Boolean logic where variables take arbitrary discrete values.
    Stated in the abstract as the basis for the native solver design.
  • domain assumption Unit resolution and clause learning can be adapted to operate natively on discrete variables while preserving soundness.
    Core design claim of the solver; no proof or reference supplied in abstract.

pith-pipeline@v0.9.0 · 5445 in / 1458 out tokens · 49468 ms · 2026-05-12T03:53:38.258700+00:00 · methodology

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Reference graph

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