Twelf

Twelf declarations, each row carrying the statement and, where present, the proof.

Source

• Repository: https://github.com/standardml/twelf
• Commit: b72cc28cd61c1114a79dcbb32f04ac6202fb379a
• Files: 1004
• License: other

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: 21,193
• With proof: 380 (1.8%)
• With docstring: 0 (0.0%)
• Libraries: 66

By type

Type	Count
constant	21,193

Example

_ : nd (A imp A)
= (impe
    (impe
        (impi
        ([u:nd (A imp (B imp A) imp A)]
            impi
               ([v:nd (A imp B imp A)]
               impi ([w:nd A] impe (impe u w) (impe v w)))))
        (impi ([u:nd A] impi ([v:nd (B imp A)] u))))
    (impi ([u:nd A] impi ([v:nd B] u)))).

• type: constant | symbolic_name: _ | examples/handbook/fol.elf

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{twelf_dataset,
  title  = {Twelf},
  author = {Norton, Charles},
  year   = {2026},
  note   = {Extracted from https://github.com/standardml/twelf, commit b72cc28cd61c},
  url    = {https://huggingface.co/datasets/phanerozoic/Twelf}
}