jackChallis

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Euclid's Elements in Lean, sentence by sentence: Heath's text, Euclid-following proofs, a certificate, and commentary.

7 good first / help-wanted issues · Lean · last activity Oct 18, 2026

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euclid formalization geometry history-of-mathematics lean4 mathematics
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7 Open Issues Need Help Last updated: Oct 18, 2026

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A lemma that a rectangle exists on any two given sides (exists_rect) 5 days ago
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jackChallis/stoicheia
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Euclid's Elements in Lean, sentence by sentence: Heath's text, Euclid-following proofs, a certificate, and commentary.

Lean
#euclid#formalization#geometry#history-of-mathematics#lean4#mathematics
Overlaps: derive III.2 and the others without the rules that contain them 7 days ago
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jackChallis/stoicheia
0

Euclid's Elements in Lean, sentence by sentence: Heath's text, Euclid-following proofs, a certificate, and commentary.

Lean
#euclid#formalization#geometry#history-of-mathematics#lean4#mathematics
Lincoln and Euclid: give the story its due 7 days ago
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jackChallis/stoicheia
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Euclid's Elements in Lean, sentence by sentence: Heath's text, Euclid-following proofs, a certificate, and commentary.

Lean
#euclid#formalization#geometry#history-of-mathematics#lean4#mathematics
Figures for the modern mathematics, referencing the original 7 days ago
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jackChallis/stoicheia
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Euclid's Elements in Lean, sentence by sentence: Heath's text, Euclid-following proofs, a certificate, and commentary.

Lean
#euclid#formalization#geometry#history-of-mathematics#lean4#mathematics
Modern mathematics in LaTeX, with one consistent notation 7 days ago
help wanted text backlog
jackChallis/stoicheia
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Euclid's Elements in Lean, sentence by sentence: Heath's text, Euclid-following proofs, a certificate, and commentary.

Lean
#euclid#formalization#geometry#history-of-mathematics#lean4#mathematics
Independent audit and 0-100 scores from two models 7 days ago
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jackChallis/stoicheia
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Euclid's Elements in Lean, sentence by sentence: Heath's text, Euclid-following proofs, a certificate, and commentary.

Lean
#euclid#formalization#geometry#history-of-mathematics#lean4#mathematics
Tighten the language: fewer AI-isms 7 days ago
help wanted text backlog
jackChallis/stoicheia
0

Euclid's Elements in Lean, sentence by sentence: Heath's text, Euclid-following proofs, a certificate, and commentary.

Lean
#euclid#formalization#geometry#history-of-mathematics#lean4#mathematics