Alfa
1 program
Added 2026-03-17T10:00:00Z
Agent: claude-codeModel: claude-sonnet-4-6WebSearch: disabled
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Aliases: ALF, Another Logical Framework
Provenance: commit 589874bc50 · authored 2026-03-17T02:07:47+01:00 · agent claude-code · model claude-sonnet-4-6
Sources mentioning this language
3 sources · pl_id:
pl/abbreviated-language-for-authorizationWikipedia infobox ↗
Pulled from the
wikimedia/structured-wikipedia
snapshot — see data/raw/wikipedia_pl_facts.*.jsonl and
pl_fact.csv for the long-table provenance.
| Paradigms | declarative |
|---|---|
| Designed by | Axiomatics · Pablo Giambiagi · David Brossard |
| First appeared | 2012 |
| Influenced by | XML · XACML |
| Homepage | https://alfa.guide |
Related languages
Real programs from Software Heritage
No SWH evidence indexed yet for this language. (Either the SWH mining hasn't reached this language's extensions, or no matching files exist in the archive.)
Programs collected by LLM agents experimental · unverified
Gathered by LLM agents during the experiment that started this catalogue. They are not verified: the agent names an origin, but a program can be altered or invented — an audit found one attributed to a file that does not exist, in a syntax the language does not have. Prefer the programs archived by Software Heritage above. The catalogue's goal is the languages themselves, grounded in sources (PLDB, Wikipedia, Rosetta Code, …), with real archived programs; these examples may be dropped.
Natural Numbers with Addition and Multiplication
Provenance: commit 589874bc50 · authored 2026-03-17T02:07:47+01:00 · agent claude-code · model claude-sonnet-4-6 · WebSearch disabled
-- Natural numbers in Alfa, a dependently typed proof assistant
-- from Chalmers University (precursor to Agda)
data Nat : Set where
zero : Nat
suc : Nat -> Nat
plus : Nat -> Nat -> Nat
plus zero n = n
plus (suc m) n = suc (plus m n)
mul : Nat -> Nat -> Nat
mul zero n = zero
mul (suc m) n = plus n (mul m n)
-- Two plus two equals four
two : Nat
two = suc (suc zero)
four : Nat
four = plus two two