{"product_id":"9780486669809","title":"On Formally Undecidable Propositions of 'Principia Mathematica' and Related Systems","description":"\u003cp\u003eFirst English translation of revolutionary paper (1931) that established that even in elementary parts of arithmetic, there are propositions which cannot be proved or disproved within the system. Introduction by R. B. Braithwaite.\u003c\/p\u003e","brand":"Dover Publications Inc.","offers":[{"title":"Default Title","offer_id":48763851538667,"sku":"00000_00000_00000_00000","price":21.88,"currency_code":"SGD","in_stock":false}],"url":"https:\/\/kinokuniya.com.sg\/ja\/products\/9780486669809","provider":"Books Kinokuniya Singapore","version":"1.0","type":"link"}