{"product_id":"an-introduction-to-modal-logic-by-g-e-hughes-m-j-cresswell-1","title":"An Introduction to Modal Logic by G.E. Hughes \u0026 M.J. Cresswell","description":"Secondhand paperback good condition. Published by Methuen and Co Ltd, 1972. This book offers a comprehensive introduction to modal logic, a fundamental area of formal logic. It covers various systems of modal logic, including T, S4, and S5, exploring concepts such as validity and propositions within these frameworks. The text serves as an academic guide to the theoretical foundations of modal reasoning.","brand":"BOOKS WORTH KEEPING","offers":[{"title":"Default Title","offer_id":43857530224699,"sku":"BKWK-41629460","price":28.99,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/9266\/3355\/files\/cc29c46ffcdd1440c2737dd493f3abe4.jpg?v=1792107539","url":"https:\/\/booksworthkeeping.co.nz\/products\/an-introduction-to-modal-logic-by-g-e-hughes-m-j-cresswell-1","provider":"Books Worth Keeping ","version":"1.0","type":"link"}