On a hitherto unexploited extension of the finitary standpoint

Journal of Philosophical Logic 9 (2):133 - 142 (1980)
P. Bernays has pointed out that, in order to prove the consistency of classical number theory, it is necessary to extend Hilbert's finitary standpoint by admitting certain abstract concepts in addition to the combinatorial concepts referring to symbols. The abstract concepts that so far have been used for this purpose are those of the constructive theory of ordinals and those of intuitionistic logic. It is shown that the concept of a computable function of finite simple type over the integers can be used instead, where no other procedures of constructing such functions are necessary except simple recursion by an integral variable and substitution of functions in each other (starting with trivial functions)
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    M. Detlefsen (1988). Essay Review. History and Philosophy of Logic 9 (1):93-105.
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