MODIFIED BAR RECURSION AND CLASSICAL DEPENDENT CHOICE
MODIFIED BAR RECURSION AND CLASSICAL DEPENDENT CHOICE
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改进的条形递归和经典相关选择
DOI:
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发表时间:
2004
期刊:
影响因子:
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通讯作者:
Paulo Oliva
中科院分区:
文献类型:
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作者:
Ulrich Berger;Paulo Oliva
We introduce a variant of Spector’s bar recursion in finite types (which we call “modified bar recursion”) to give a realizability interpretation of the classical axiom of dependent choice allowing for the extraction of witnesses from proofs of ∀∃-formulas in classical analysis. As another application, we show that the fan functional can be defined by modified bar recursion together with a version of bar recursion due to Kohlenbach. We also show that the type structure M of strongly majorizable functionals is a model for modified bar recursion. §