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.
Powers, smaller problems, and a suspicious parcel.
Search the local catalogue in English or Japanese. Major landmarks have Japanese titles. Open the full original proof on GitHub for the complete context.
FreyPackage is a structure with data fields and dependent proof fields. hFLT’s type refers to a, b, c and p defined earlier. pp : Nat.Prime p and hp5 : 5 ≤ p are stored witnesses. The terms ha4 and hb2 are equalities in finite quotient rings, not equalities of integers.
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 & attributionOne hypothetical counterexample. An unreasonable amount of baggage.
The previous chapter prepared the hypothetical numbers and their conditions. Now we build a curve from that package. The right-triangle story connected numbers to a shape; this is a new, more advanced construction, not the same theorem.
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 three stones are placeholders for integers a, b and c. The sandwich joke marks the required type, not an extra input.
Integers in the parcela : ℤStory → proofInspecting the seal stands for checking the package’s conditions, including a prime exponent at least five.
The prime needs a lower boundhp5 : 5 ≤ pStory → proofThe carefully packed device represents normalized data. The gcd-one field rules out a shared factor.
A normalized parcelhgcdab : gcd a b = 1Story → proofThe cart’s paperwork is the structure’s required evidence. A blueprint alone does not create a counterexample.
A blueprint needs evidencestructure FreyPackage whereFreyPackage is a structure with data fields and dependent proof fields. hFLT’s type refers to a, b, c and p defined earlier. pp : Nat.Prime p and hp5 : 5 ≤ p are stored witnesses. The terms ha4 and hb2 are equalities in finite quotient rings, not equalities of integers.
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 suspicious parcel
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 →