LLMs are changing the economics of TLA+ modular verification

tianyin_xu · x · 2026-08-28

Blog post discusses the composition and modular verification of TLA+ specs.

Key Insight: While standard advice avoids modular verification due to the complexity of expanding conjunctions of specs (Spec1 /\ Spec2) in model checkers like TLC, the author argues this advice is due for revision. LLMs combined with TLAPS are quietly changing the economics, making modular verification a rational default.

The post details the mathematical basis of the compositionality problem and the challenges with shared variables.

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