The baire category theorem in weak subsystems of second-order arithmetic

Journal of Symbolic Logic 58 (2):557-578 (1993)
Working within weak subsystems of second-order arithmetic Z2 we consider two versions of the Baire Category theorem which are not equivalent over the base system RCA0. We show that one version (B.C.T.I) is provable in RCA0 while the second version (B.C.T.II) requires a stronger system. We introduce two new subsystems of Z2, which we call RCA+ 0 and WKL+ 0, and show that RCA+ 0 suffices to prove B.C.T.II. Some model theory of WKL+ 0 and its importance in view of Hilbert's program is discussed, as well as applications of our results to functional analysis
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DOI 10.2307/2275219
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References found in this work BETA
W. W. Tait (1981). Finitism. Journal of Philosophy 78 (9):524-546.
Wilfried Sieg (1985). Fragments of Arithmetic. Annals of Pure and Applied Logic 28 (1):33-71.

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Jeremy Avigad (2004). Forcing in Proof Theory. Bulletin of Symbolic Logic 10 (3):305-333.

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