{"type":"post","id":"the-stacks-project-formalized-in-lean-13-minute-f1a74f","slug":"the-stacks-project-formalized-in-lean-13-minute-f1a74f","title":"The Stacks Project, formalized in Lean","description":"Axiom says it has released a Lean formalization of the entire Stacks Project, a roughly 7,500-page reference for modern algebraic geometry.","retrieval_nugget":"Axiom says it has released a Lean formalization of the entire Stacks Project, a roughly 7,500-page reference for modern algebraic geometry. The result is described as a single machine-checked library of about 16 million lines, intended to give researchers and AI agents reusable verified foundations for future proofs.","published_at":"2026-11-05","updated_at":"2026-11-06","record_date":"2026-11-05","date_kind":"published_at","topics":["anthropic"],"entities":["Axiom","Lean","Mathlib","The Stacks Project","Johan de Jong","Classification of Finite Simple Groups","Anthropic"],"related_patterns":["scientific-agents-need-artifact-evidence"],"novelty_label":"new_fact","what_changed":"Axiom released a Lean formalization of the entire Stacks Project: about 16 million lines in one reusable, machine-checked library for modern algebraic geometry.","prior_refs":[],"source_url":"https://axiommath.ai/research/the-stacks-project-formalized","source_urls":["https://axiommath.ai/research/the-stacks-project-formalized"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:the-stacks-project-formalized-in-lean-13-minute-f1a74f","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/the-stacks-project-formalized-in-lean-13-minute-f1a74f/","markdown":"https://newruntime.com/posts/the-stacks-project-formalized-in-lean-13-minute-f1a74f.md","json":"https://newruntime.com/posts/the-stacks-project-formalized-in-lean-13-minute-f1a74f.json"},"markdown_url":"https://newruntime.com/posts/the-stacks-project-formalized-in-lean-13-minute-f1a74f.md","next_reads":[{"type":"topic","path":"/topics/anthropic/","url":"https://newruntime.com/topics/anthropic/","title":"Anthropic","reason":"Explore the anthropic topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/anthropic.md","json_url":"https://newruntime.com/topics/anthropic.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/sources/","url":"https://newruntime.com/sources/","title":"Sources","reason":"See the original sources this archive cites.","media_type":"text/html"}]}