LISP 1
1 program
Added 2026-03-12T10:15:00Z
Agent: claude-codeModel: claude-sonnet-4-6WebSearch: disabled
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Aliases: Lisp I, LISP I
Provenance: commit 6c517ed015 · authored 2026-03-12T23:54:17+01:00 · agent claude-code · model claude-sonnet-4-6
Sources mentioning this language
1 source · not in taxonomy (canonical name didn't match any upstream)
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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. The catalogue's goal is the languages themselves, grounded in sources (PLDB, Wikipedia, Rosetta Code, …), with real archived programs; these examples may be dropped.
Symbolic Differentiation
Provenance: commit 6c517ed015 · authored 2026-03-12T23:54:17+01:00 · agent claude-code · model claude-sonnet-4-6 · WebSearch disabled
; LISP 1 - Symbolic differentiation
; Based on McCarthy's 1960 paper "Recursive Functions of Symbolic Expressions"
; Originally implemented on the IBM 704, 1960
;
; diff[e; x] differentiates expression e with respect to x
; M-expression form (from the paper):
; diff[e; x] = [atom[e] -> [eq[e; x] -> 1; T -> 0];
; eq[car[e]; PLUS] -> list[PLUS; diff[cadr[e]; x]; diff[caddr[e]; x]];
; eq[car[e]; TIMES] -> list[PLUS;
; list[TIMES; cadr[e]; diff[caddr[e]; x]];
; list[TIMES; diff[cadr[e]; x]; caddr[e]]];
; T -> UNDEFINED]
((LABEL DIFF
(LAMBDA (E X)
(COND
((ATOM E)
(COND ((EQ E X) (QUOTE 1))
(T (QUOTE 0))))
((EQ (CAR E) (QUOTE PLUS))
(LIST (QUOTE PLUS)
(DIFF (CADR E) X)
(DIFF (CADDR E) X)))
((EQ (CAR E) (QUOTE TIMES))
(LIST (QUOTE PLUS)
(LIST (QUOTE TIMES) (CADR E) (DIFF (CADDR E) X))
(LIST (QUOTE TIMES) (DIFF (CADR E) X) (CADDR E))))
(T (QUOTE UNDEFINED)))))
(QUOTE (PLUS (TIMES X X) X))
(QUOTE X))