Get Started with Lean Proof Assistant
Lean is an open-source programming language and proof assistant designed for creating correct and maintainable code. It features powerful automation tools like 'Grind' for efficient theorem proving and supports extensive metaprogramming capabilities. Lean is utilized in various verification projects, demonstrating its effectiveness in both academic and industrial applications.
- ▪Lean enables the creation of formally verified code through its proof assistant capabilities.
- ▪The 'Grind' tool automates complex theorem proving tasks, making it easier to manage intricate mathematical proofs.
- ▪Lean is used in real-world verification projects, such as AWS's Cedar authorization policy language and Rust program verification.
2 outlets in our directory ran this story, first to last over 25 hours. All of the coverage we found sits in one bucket: centre. That one-sidedness is itself worth noticing.
- ▪ 50 Years of Proof Assistants — Github
Hacker News (Newest) files mainly under programming. We currently carry 5,306 of its stories.
Story provenance
Source · retrieval · rights · ranking — open for full record
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Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | Lean Language |
| Canonical URL | https://lean-lang.org/ |
| Publication time | Mon, 25 May 2026 13:19:29 +0000 |
| Retrieval time | 2026-05-25T13:37:37.815Z |
| Last seen | 2026-05-25T13:37:37.815Z |
| 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 | F8zD6a-FR7cZ · 2 stories |
| 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
The Proof in the Code by Kevin Hartnett FROM Quanta Books | Pre-order now, available June 9 Lean is an open-source programming language and proof assistant that enables correct, maintainable, and formally verified code InstallLearn Powerful automation Mathematics -- 'Grind' efficiently manages complex pattern matching and -- case analysis beyond standard tactics. example (x : Nat) : 0 < match x with | 0 => 1 | n+1 => x + n := by grind -- Automatically solves systems of linear inequalities.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at Lean Language.
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