# norvig/paip-lisp

Lisp code for the textbook "Paradigms of Artificial Intelligence Programming"

Repository: https://github.com/norvig/paip-lisp
Canonical: https://ross.abutalabs.com/products/paip-lisp
Language: Common Lisp
License: MIT
License Family: permissive
Last push: 2024-10-15T03:26:54+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3131, "days_push": 687, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 7503, forks 722 (observed 2026-08-28T04:10:00.353397+00:00)

## What it is
Open-source repository for Peter Norvig's classic textbook 'Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp', including the full text in markdown/epub/pdf formats and all accompanying Common Lisp source code. It covers classic AI programming paradigms such as search, logic programming, expert systems, and natural language processing.

## Use cases
- learn classic AI programming techniques in Common Lisp
- study search algorithms, logic programming, and unification grammars
- read a free ebook version of Norvig's PAIP textbook
- explore implementations of Eliza, GPS, and expert systems
- learn Lisp through worked AI case studies
- find source code examples from the PAIP book

## When to choose
- you want to learn Common Lisp through substantive AI programming examples
- you're studying the history and foundations of symbolic AI
- you want a free, legal copy of the PAIP textbook and its code
- you're interested in classic techniques like Prolog interpreters, expert systems, and NLP grammars

## When to avoid
- you need modern deep learning or machine learning methods
- you want a maintained software library rather than a book and code samples
- you're not comfortable reading 1990s-era Lisp code

## Facets
- artifact type: learning-resource
- maturity: maintenance
- function: interpreter, parser, nlp, search-engine, compiler
- domain: artificial-intelligence, programming-languages, tutorials, education
- platform: cross-platform, cli
- tags: common-lisp, textbook, classic-ai, ebook, peter-norvig, symbolic-computation, logic-programming, natural-language-processing

## Member repositories
- norvig/paip-lisp (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:00.353397+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:37:31.620054+00:00, confidence not recorded.
  - readme: https://github.com/norvig/paip-lisp (fetched 2026-08-28T04:10:00.353397+00:00, sha 14663e950977)
- Data as of 2026-08-30T08:39:29.467469+00:00.