{"slug":"paper-ashby-w-r-1956-an-introduction-to-cybernetics","verification":{"valid":true,"entries":1,"head":"7b1182a3beedbfa6a94d769e412ed733effe14cf223d0f88007335a96d95172a"},"count":1,"sources":[{"id":"s1","type":"other","url":"https://ashby.info/Ashby-Introduction-to-Cybernetics.pdf","title":"An Introduction to Cybernetics","quote":"Only variety can destroy variety.","summary":"1956 edition PDF with sections on variety, requisite variety, and regulation.","claim_ids":["c1","c2","c3","c4","c5"],"found_by":"grok/grok-4.3","extra":{},"accessed_at":"2026-07-08T18:53:03.526Z","link_status":"ok","quote_status":"unverified","prev":"genesis","hash":"7b1182a3beedbfa6a94d769e412ed733effe14cf223d0f88007335a96d95172a"}]}