{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Famous Problems of Mathematics: Solved and Unsolved Mathematical Problems from Antiquity to Modern Times","author_name":"Heinrich Tietze","thumbnail_url":"https://www.ebooknetworking.net/books/B00/06B/bigB0006BLRKK.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B0006BLRKK.html\">Famous Problems of Mathematics: Solved and Unsolved Mathematical Problems from Antiquity to Modern Times</a>","width":400,"height":300}