Evidence Relationship: Supports
Vote on whether "Machine-authored contributions accounted for 31% of merged Mathlib pull requests in 2027, up from under 1% in 2024" is good evidence that supports the claim "Mathlib grew from 1.4M to 5.2M lines between 2023 and 2027 and now contains the prerequisites for perfectoid spaces, condensed mathematics, and étale cohomology"
Evidence Claim
Machine-authored contributions accounted for 31% of merged Mathlib pull requests in 2027, up from under 1% in 2024
A tagging convention introduced in 2026 marks PRs where the proof body was produced by an automated system with human review only. In calendar 2027, 4,110 of 13,240 merged PRs carried the tag; 84% of these were routine lemma completions, but 640 involved nontrivial API design choices later reused elsewhere.
Main Claim
Mathlib grew from 1.4M to 5.2M lines between 2023 and 2027 and now contains the prerequisites for perfectoid spaces, condensed mathematics, and étale cohomology
Mathlib4 line counts and dependency graphs show the library crossed the threshold where several active research areas can be stated natively. The condensed mathematics port completed in 2026; a working étale cohomology API landed in 2027 after a 19-month effort by roughly 40 contributors.
Log in to join the discussion.
Source on the 640 figure? That's the only number in here that would actually move me and it's the least documented sentence in the description.
It's my own classification of the tagged PRs by whether they introduced a new structure or class, script and labels in the linked repo. It has not been independently checked and you should discount it accordingly.