{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"On Formally Undecidable Propositions of Principia Mathematica and Related Systems","author_name":"Kurt Gödel","thumbnail_url":"https://www.ebooknetworking.net/books/048/666/big0486669807.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-0486669807.html\">On Formally Undecidable Propositions of Principia Mathematica and Related Systems</a>","width":400,"height":300}