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  1. Subsystems of Second Order Arithmetic.Stephen G. Simpson - 1999 - Studia Logica 77 (1):129-129.
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  • Countable algebra and set existence axioms.Harvey M. Friedman - 1983 - Annals of Pure and Applied Logic 25 (2):141.
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  • Elements of mathematical logic.Georg Kreisel - 1967 - Amsterdam,: North Holland Pub. Co.. Edited by J. L. Krivine.
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  • Subsystems of Second Order Arithmetic.Stephen George Simpson - 1998 - Springer Verlag.
    Stephen George Simpson. with definition 1.2.3 and the discussion following it. For example, taking 90(n) to be the formula n §E Y, we have an instance of comprehension, VYEIXVn(n€X<—>n¢Y), asserting that for any given set Y there exists a ...
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