{ "item_title" : "The Collected Papers of Bertrand Russell, Volume 5", "item_author" : [" Bertrand Russell", "Gregory Moore "], "item_description" : "This volume of Bertrand Russell's Collected Papers finds Russell focused on writing Principia Mathematica during 1905-08. Eight previously unpublished papers shed light on his different versions of a substitutional theory of logic, with its elimination of classes and relations, during 1905-06. A recurring issue for him was whether a type hierarchy had to be part of a substitutional theory. In mid-1907 he began writing up the final version of Principia, now using a ramified theory of types, and eleven unpublished drafts from 1907-08 deal with this. Numerous letters show his thoughts on the process.The volume's 80-page introduction covers the evolution of his logic from 1896 until 1909, when volume I of Principia went to the printer.", "item_img_path" : "https://covers2.booksamillion.com/covers/bam/0/41/582/098/0415820987_b.jpg", "price_data" : { "retail_price" : "690.00", "online_price" : "690.00", "our_price" : "690.00", "club_price" : "690.00", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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