{"product_id":"open-door-to-number-theory-book-duff-campbell-9781470443481","title":"An Open Door to Number Theory","description":"A well-written, inviting textbook designed for a one-semester, junior-level course in elementary number theory. The approach throughout is geometric and intuitive; there are over 400 carefully designed exercises, which include a balance of calculations, conjectures, and proofs. There are also nine substantial student projects on topics not usually covered in a first-semester course.","brand":"WoB","offers":[{"title":"US \/ GOOD \/ SBYB","offer_id":49883668807953,"sku":"CIN1470443481G","price":100.22,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/1470443481.jpg?v=1763477086","url":"https:\/\/www.worldofbooks.com\/products\/open-door-to-number-theory-book-duff-campbell-9781470443481","provider":"World of Books ","version":"1.0","type":"link"}