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The model-theoretic ordinal analysis of theories of predicative strength

Published online by Cambridge University Press:  12 March 2014

Jeremy Avigad
Affiliation:
Department of Philosophy, Carnegie Mellon University, Pittsburgh, Pa 15213, USA E-mail: [email protected]
Richard Sommer
Affiliation:
Center for the Study of Language and Information, Stanford University, Stanford, CA 94305-4115, USA E-mail: [email protected]

Abstract

We use model-theoretic methods described in [3] to obtain ordinal analyses of a number of theories of first- and second-order arithmetic, whose proof-theoretic ordinals are less than or equal to Γ0.

Type
Research Article
Copyright
Copyright © Association for Symbolic Logic 1999

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References

REFERENCES

[1]Aczel, Peter, An introduction to inductive definitions, The handbook of mathematical logic (Barwise, J., editor), North-Holland, 1977, pp. 739–782.Google Scholar
[2]Avigad, Jeremy, On the relationship between ATR0 and , this Journal, vol. 61 (1996), pp. 768–779.Google Scholar
[3]Avigad, Jeremy and Sommer, Richard, A model-theoretic approach to ordinal analysis, Bulletin of Symbolic Logic, vol. 3 (1997), pp. 17–52.CrossRefGoogle Scholar
[4]Feferman, Solomon, Systems of predicative analysis, this Journal, vol. 29 (1964), pp. 1–30.Google Scholar
[5]Feferman, Solomon, Iterated inductive fixed-point theories: application to hancock's conjecture, Patras logic symposium (Metakides, G., editor), North-Holland, 1982.Google Scholar
[6]Friedman, Harvey, Iterated inductive definitions and , Inflationism and proof theory (Kino, A.et al., editors), North-Holland, 1970, pp. 435–442.Google Scholar
[7]Friedman, Harvey, McAloon, Kenneth, and Simpson, Stephen, A finite combinatorial principle which is equivalent to the 1-consistency of predicative analysis, Patras logic symposium (Metakides, G., editor), North-Holland, 1982, pp. 197–230.Google Scholar
[8]Pohlers, Wolfram, Proof theory: an introduction, Lecture Notes in Mathematics, vol. 1407, Springer-Verlag, 1989.CrossRefGoogle Scholar
[9]Simpson, Stephen, Subsystems of Z2 and reverse mathematics, appendix to Gaisi Takeuti, Proof theory, second edition, North-Holland, 1987.Google Scholar
[10]Simpson, Stephen, On the strength of König's duality theorem of countable bipartite graphs, this Journal, vol. 59 (1994), pp. 113–123.Google Scholar
[11]Simpson, Stephen, Subsystems of second order arithmetic, Springer-Verlag, 1998.Google Scholar
[12]Sommer, Richard, Transfinite induction within Peano arithmetic, Annals of Pure and Applied Logic, vol. 76 (1995), pp. 231–289.CrossRefGoogle Scholar