Where is the Gödel-point hiding: Gentzen¿s Consistency Proof of 1936 and His Representation of Constructive Ordinals

Unique detailed explanation of the first published consistency proof of PA (peano arithmetic)Includes Gentzen's unusual notation for ordinal numbers up to e_0 and its connection to Cantor normal formProbably the most important step in the history of proof theory analysedIncludes supplementary material: sn.pub/extras