Show HN: Formally verified 3D CSG: Trust 93 lines spec, not 1000 lines AI code
A human reviewer only needs to read 93 lines of formal specification and run the Lean checker as described below to certify the correctness of the kernel, skipping the intricate 1000+ lines of AI-written implementation. To prove correctness, AI autonomously wrote over 60,000 lines of Lean proofs, which also never have to be inspected by a human. The Lean checker guarantees conformance to the specification at compile time, with zero trust placed in any LLM.
- ▪A human reviewer only needs to read 93 lines of formal specification and run the Lean checker as described below to certify the correctness of the kernel, skipping the intricate 1000+ lines of AI-written implementation.
- ▪To prove correctness, AI autonomously wrote over 60,000 lines of Lean proofs, which also never have to be inspected by a human.
- ▪The Lean checker guarantees conformance to the specification at compile time, with zero trust placed in any LLM.
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Story provenance
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Record
| Original publisher | GitHub |
| Canonical URL | https://github.com/schildep/verified-3d-mesh-intersection |
| Publication time | Tue, 28 Jul 2026 13:07:14 +0000 |
| Retrieval time | 2026-07-28T13:14:50.609Z |
| Last seen | 2026-07-28T13:14:50.609Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | U46eZsn0Gbra |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Formally verified 3D mesh intersection - trust 93 lines of spec, not 1000+ lines of AI-written code To my knowledge, this is the first formally verified implementation of a 3D constructive solid geometry (CSG) operation: mesh intersection, implemented in Lean 4 and verified against a concise specification that pins down the surface of the resulting mesh exactly and guarantees practical well-formedness conditions on the triangulation. (See also related work.) This project is also an experiment in avoiding having to trust AI-generated code. A human reviewer only needs to read 93 lines of formal specification and run the Lean checker as described below to certify the correctness of the kernel, skipping the intricate 1000+ lines of AI-written implementation.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at GitHub.