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arXiv · 2602.18657

DSLean: A Framework for Type-Correct Interoperability Between Lean 4 and External DSLs

Tate Rowney·Riyaz Ahuja·Jeremy Avigad·Sean Welleck
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Abstract

Domain-specific languages (DSLs) mediate interactions between interactive proof assistants and external automation, but translating between the prover's internal representation and such DSLs is a tedious engineering chore. To simplify this task, we present DSLean, a framework for bidirectional translation between expressions in the Lean proof assistant and external syntax. DSLean requires only a specification of an external language and its Lean equivalents, abstracting away meta-level implementation details. We demonstrate DSLean's capabilities by implementing three new automation tactics, providing access to external solvers for interval arithmetic, ordinary differential equations, and ring ideal membership.

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Tate Rowney, Riyaz Ahuja, Jeremy Avigad, Sean Welleck. 2026-02-20. DSLean: A Framework for Type-Correct Interoperability Between Lean 4 and External DSLs. https://arxiv.org/abs/2602.18657

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