


Alan Turing's Systems of Logic:  Andrew Appel on Alan Turing's legacy 
Between inventing the concept of a universal computer in 1936 and breaking the German Enigma code during World War II, Alan Turing (19121954), the British founder of computer science and artificial intelligence, came to Princeton University to study mathematical logic. Some of the greatest logicians in the worldincluding Alonzo Church, Kurt Gödel, John von Neumann, and Stephen Kleenewere at Princeton in the 1930s, and they were working on ideas that would lay the groundwork for what would become known as computer science. Though less well known than his other work, Turing's 1938 Princeton PhD thesis, "Systems of Logic Based on Ordinals," which includes his notion of an oracle machine, has had a lasting influence on computer science and mathematics. This book presents a facsimile of the original typescript of the thesis along with essays by Andrew Appel and Solomon Feferman that explain its stillunfolding significance. A work of philosophy as well as mathematics, Turing's thesis envisions a practical goala logical system to formalize mathematical proofs so they can be checked mechanically. If every step of a theorem could be verified mechanically, the burden on intuition would be limited to the axioms. Turing's point, as Appel writes, is that "mathematical reasoning can be done, and should be done, in mechanizable formal logic." Turing's vision of "constructive systems of logic for practical use" has become reality: in the twentyfirst century, automated "formal methods" are now routine. Presented here in its original form, this fascinating thesis is one of the key documents in the history of mathematics and computer science. Andrew W. Appel is the Eugene Higgins Professor and Chairman of the Department of Computer Science at Princeton University. "This book presents the story of Turing's work at Princeton University and includes a facsimile of his doctoral dissertation, 'Systems of Logic Based on Ordinals,' which he completed in 1936. The author includes a detailed history of Turing's work in computer science and the attempts to ground the field in formal logic."Mathematics Teacher "Presented here in its original form, this fascinating thesis is one of the key documents in the history of mathematics and computer science."World Book Industry Endorsement: "For me, this is the most interesting of Alan Turing's writings, and it is a real delight to see a facsimile of the original typescript here. The work is packed with ideas that have turned out to be significant for all sorts of current research areas in computer science and mathematics."Barry Cooper, University of Leeds Preface ix Subject Areas:
 
 
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