Lean4-FLT

Structured dataset from FLT — Formalization of Fermat's Last Theorem.

Source

• Repository: https://github.com/ImperialCollegeLondon/FLT
• Commit: 6cffefeb368ca4cfabc907f86f96783a49ae4033
• Files: 179
• License: apache-2.0

Schema

Column	Type	Description
statement	string	Declaration signature/claim with the leading keyword removed (verbatim slice); the full declaration minus its proof
proof	string	Verbatim proof/body, empty if the declaration has none
type	string	Declaration keyword
symbolic_name	string	Declaration identifier
library	string	Sub-library
filename	string	Repository-relative source path
imports	list[string]	File-level Require/Import modules
deps	list[string]	Intra-corpus identifiers referenced
docstring	string	Preceding documentation comment, empty if absent
source_url	string	Upstream repository
commit	string	Upstream commit extracted

Statistics

• Entries: 1,754
• With proof: 1,712 (97.6%)
• With docstring: 700 (39.9%)
• Libraries: 71

By type

Type	Count
lemma	784
def	467
theorem	297
instance	88
abbrev	75
class	25
structure	14
axiom	3
macro	1

Example

PNat.pow_add_pow_ne_pow
    (x y z : ℕ+)
    (n : ℕ) (hn : n > 2) :
    x^n + y^n ≠ z^n
PNat.pow_add_pow_ne_pow_of_FermatLastTheorem Wiles_Taylor_Wiles x y z n hn

/--
info: 'PNat.pow_add_pow_ne_pow' depends on axioms: [propext, sorryAx, Classical.choice, Quot.sound]
-/
#guard_msgs in
#print axioms PNat.pow_add_pow_ne_pow

• type: theorem | symbolic_name: PNat.pow_add_pow_ne_pow | FermatsLastTheorem.lean

Use

Each declaration is split into a statement (signature/claim) and a proof (body) that are disjoint and together form the complete declaration, for proof modeling, autoformalization, retrieval, and dependency analysis via deps.

Citation

@misc{lean4_flt_dataset,
  title  = {Lean4-FLT},
  author = {Norton, Charles},
  year   = {2026},
  note   = {Extracted from https://github.com/ImperialCollegeLondon/FLT, commit 6cffefeb368c},
  url    = {https://huggingface.co/datasets/phanerozoic/Lean4-FLT}
}