Acknowledgements.- 1 Introduction.- 2 Preliminaries.- 3 Ordinal numbers.- 4 Consistency proof.- Index.- References.
From the book reviews: "This book deals with G. Gentzen's classical 1936 article on the consistency of arithmetic ... . The result is a clear exposition of the full proof with all details and with the ideas behind the proof visible. ... All in all, the author of this book has accomplished the difficult task of making Gentzen's original hard-to-read paper accessible to the historically interested logician." (Christian Bennet, Mathematical Reviews, November, 2014)