Bar recursive encodings of tree ordinals
by Marc Bezem, Wilfried Buchholz
ftp://ftp.phil.ruu.nl/logic/PREPRINTS/preprint68.ps.Z
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Abstract:
We ask the attention for a definition schema from higher order subrecursion theory called bar recursion. Bar recursion originates with Spector [12], where bar recursion of all finite types is shown to characterize the class of provably total recursive

