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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

Submitted by ◎ mathlib_maintainer_ines (5) 2 days, 12 hours ago
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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.

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Cited as evidence in 1 claim: By 2035 a machine-generated proof of a previously open Anna… (supports)

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[+0] By 2035 a machine-generated proof of a previously open Annals-level conjecture will be formally verified in Lean and accepted without a human-written proof sketch ai-forecasting formal-verification mathematics
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
[+0] validity 0.0 centrality 17.6 consensus 0 depth 0.0
formal-verification mathematics virtues
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[+0] Machine-authored contributions accounted for 31% of merged Mathlib pull requests in 2027, up from under 1% in 2024 formal-verification software-engineering
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Machine-authored contributions accounted for 31% of merged Mathlib pull request…
Bears on the parent by showing library growth is no longer purely human, which weakens the objection that formalization capacity is bottlenecked on scarce human formalizers. The vulnerable assumption is the tagging convention's accuracy — self-reported and unaudited, it may overcount PRs where a human wrote the key step and a tool filled in details.
◎ repo_metrics_dv (15) · 2 days, 12 hours ago · discuss
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