Follow the story. Try a proof. Let curiosity choose how deep you go.
Walk in through the manga: seventeen chapters, sixty-four pocket pebbles, zero required formulas. The Lean source stays behind glass until you ask for it.
Straight to the mathematicsBegin at the proof map — thousands of named theorems — then climb the full ladder from clock inverses to R = T. The story keeps telling itself beside you; it will keep you honest.
Made for company: one reader who loves math and one who does not — one sofa. Whatever each of you finds carries over to the tea salon.
Seventeen chapters, one extraordinary argument. One small discovery is enough for today.
Pip’s rule: mistakes are clues. Every chapter is open, and every question allows another try.
Lower the level. Empty the room. Close the case.
Search the local catalogue in English or Japanese. Major landmarks have Japanese titles. Open the full original proof on GitHub for the complete context.
The #guard_msgs block checks the diagnostic produced by #print axioms fermat_last_theorem. flt_pinned forces the explicit target signature; flt_mathlib inhabits Mathlib’s FermatLastTheorem by converting nonzero hypotheses with Nat.pos_of_ne_zero. A source snapshot is not an .olean/kernel-check result. Our stored snapshot is not tagged as locally Lean-verified.
Annotated original · not a live Lean statePoint to a story clue or a highlighted term to connect the two.
Try this logical move →Source: anthropics/fermats-last-theorem @ aa2d8b3. Upstream reports verification; this reader has not independently rebuilt the project. Manga explanations are not formal proofs.
Source license & attributionPip’s dramatic monologue has failed the type checker.
The contradiction completes the mathematical route we read. This final chapter separates understanding that route, inspecting Lean source, and actually checking it with the Lean kernel. Reading this site does not run that full check.
These links explain the reading route. A story analogy is not a proof of this theorem.
Already familiar? Keep reading. Otherwise, open a word or follow the prerequisites from the beginning.
Story → proofThe book presented to the owl is the imported theorem and its dependencies. This short checkpoint is not the whole proof.
Open the actual theoremimport Theorems.Thm_fermat_last_theoremStory → proofThe owl’s inspection is #print axioms: asking Lean which foundational axioms the theorem depends on. Applause supplies no evidence.
Ask for the dependencies#print axioms fermat_last_theoremStory → proofThe three shapes represent propext, Classical.choice and Quot.sound. They are foundations, not an assumption that FLT is true.
Read the reported foundationspropext, Classical.choice, Quot.soundStory → proofClosing the book includes matching theorem formulations: for natural numbers, nonzero evidence gives the required positivity.
Nonzero becomes positiveNat.pos_of_ne_zero haThe #guard_msgs block checks the diagnostic produced by #print axioms fermat_last_theorem. flt_pinned forces the explicit target signature; flt_mathlib inhabits Mathlib’s FermatLastTheorem by converting nonzero hypotheses with Nat.pos_of_ne_zero. A source snapshot is not an .olean/kernel-check result. Our stored snapshot is not tagged as locally Lean-verified.
The story and source are readable here. Enable JavaScript to edit proofs, try quizzes, and explore the interactive map.
Short scenes. Real logical goals. A pigeon who is very invested in your success.
Opening the casebook…
The extremely literal judge
Start with the cake-scale story. You only need to read one small piece at a time. If you are in the Fermat story, start with Story depth, then the words listed before the chapter.
You do not need to know Lean, symbols or university mathematics to begin. Definitions come first in the small stories.
Look at the small example before the general formula. Ask what changed and what stayed the same.
Close this panel to return to the exact place you were reading. These are prepared hints for this page.
Start with the first small story →