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The Case Against Formal Verification, 50 Years Later
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Overview
Interest in software verification has surged, with a notable increase in Google Trends searches for formal verification and formal methods over the past two years. Many engineers are now learning Lean and exploring new specification languages, indicating a growing excitement around the topic.
Summary from ivan-gavran.github.io.
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ivan-gavran.github.io
The Case Against Formal Verification, 50 Years Later
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Community reactions
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Hacker News · ivan-gavran.github.io
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Based on 5 sampled comments from this thread. Analyzed 2026-08-17.
- Praise: Lean's powerful type system allows for making invalid states unrepresentable, a feature that stands out in the formal verification landscape.
- Praise: Building a formally verified workflow engine in Lean was surprisingly easy for one user, highlighting its potential for creating reliable systems.
- Praise: Empirical evidence from CompCert shows that formal verification can lead to high confidence in compiler correctness, outperforming traditional testing methods.
- Concern: Many commenters doubt the reliability of formal verification, questioning whether the specifications are inherently more correct than the implementations they verify.
- Concern: The model-code gap remains a significant hurdle, with users struggling to find straightforward methods to bridge the gap between formal models and actual code.
- Concern: Concerns linger that increased computational power doesn't necessarily favor formal verification over extensive testing, leaving some skeptical about its practical advantages.