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Two applications of finite side conditions at \(\omega _2\)

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We present two applications of forcing with finite sequences of models as side conditions, adding objects of size \(\omega _2\). The first involves adding a \(\Box _{\omega _1}\) sequence and variants of such sequences. The second involves adding partial weak specializing functions for trees of height \(\omega _2\).

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References

  1. Asperó, D., Mota, M.A.: A generalization of Martin’s axiom. Isr. J. Math. 210, 193–231 (2015). doi:10.1007/s11856-015-1250-0

    Article  MathSciNet  MATH  Google Scholar 

  2. Asperó, D., Mota, M.A.: Forcing consequences of \(PFA\) together with the continuum large. Trans. Am. Math. Soc. 367(9), 6103–6129 (2015)

    Article  MathSciNet  MATH  Google Scholar 

  3. Baumgartner, J.E.: Applications of the proper forcing axiom. In: Kunen, K., Vaughan, J. (eds.) Handbook of Set-Theoretic Topology, pp. 913–959. North-Holland, Amsterdam (1984)

  4. Baumgartner, J.E., Shelah, S.: Remarks on superatomic Boolean algebras. Ann. Pure Appl. Logic 33(2), 109–129 (1987)

    Article  MathSciNet  MATH  Google Scholar 

  5. Cummings, J.: Souslin trees which are hard to specialise. Proc. Am. Math. Soc. 125(8), 2435–2441 (1997)

    Article  MathSciNet  MATH  Google Scholar 

  6. Dolinar, G., Džamonja, M.: Forcing \(\square _{\omega _1}\) with finite conditions. Ann. Pure Appl. Logic 164(1), 49–64 (2013)

    Article  MathSciNet  MATH  Google Scholar 

  7. Friedman, S.-D.: Forcing with finite conditions. In: Set Theory, Trends Mathematics, pp. 285–295. Birkhäuser, Basel (2006)

  8. Friedman, S.-D.: BPFA and inner models. Ann. Jpn. Assoc. Philos. Sci. 19, 29–36 (2011)

    MathSciNet  MATH  Google Scholar 

  9. Friedman, S.-D., Krueger, J.: Thin stationary sets and disjoint club sequences. Trans. Am. Math. Soc. 359(5), 2407–2420 (2007)

    Article  MathSciNet  MATH  Google Scholar 

  10. Koszmider, P.: On strong chains of uncountable functions. Isr. J. Math. 118, 289–315 (2000)

    Article  MathSciNet  MATH  Google Scholar 

  11. Krueger, J.: Coherent adequate sets and forcing square. Fund. Math. 224(3), 279–300 (2014)

    Article  MathSciNet  MATH  Google Scholar 

  12. Krueger, J., Mota, M.A.: Coherent adequate forcing and preserving CH. J. Math. Logic 15(2), 1550005 (2015). doi:10.1142/S0219061315500051

    Article  MathSciNet  MATH  Google Scholar 

  13. Mitchell, W.J.: Adding closed unbounded subsets of \(\omega _2\) with finite forcing. Notre Dame J. Formal Logic 46(3), 357–371 (2005)

    Article  MathSciNet  Google Scholar 

  14. Mitchell, W.J.: \(I[\omega _2]\) can be the nonstationary ideal on \({\rm Cof}(\omega _1)\). Trans. Am. Math. Soc. 361(2), 561–601 (2009)

    Article  MATH  Google Scholar 

  15. Neeman, I.: Higher analogues of the proper forcing axiom (in preparation)

  16. Neeman, I.: Forcing with sequences of models of two types. Notre Dame J. Form. Log. 55(2), 265–298 (2014)

    Article  MathSciNet  MATH  Google Scholar 

  17. Rubin, M., Shelah, S.: Combinatorial problems on trees: partitions, \(\Delta \)-systems and large free subtrees. Ann. Pure Appl. Logic 33(1), 43–81 (1987)

    Article  MathSciNet  MATH  Google Scholar 

  18. Sakai, H.: Chang’s conjecture and weak square. Arch. Math. Logic 52(1–2), 29–45 (2013)

    Article  MathSciNet  MATH  Google Scholar 

  19. Shelah, S.: Proper Forcing. Lecture Notes in Mathematics, vol. 940. Springer, Berlin (1982)

  20. Shelah, S., Stanley, L.: Weakly compact cardinals and nonspecial Aronszajn trees. Proc. Am. Math. Soc. 104(3), 887–897 (1988)

    Article  MathSciNet  MATH  Google Scholar 

  21. Todorčević, S.: Stationary sets, trees and continuums. Publ. Inst. Math. (Beograd) (N.S.) 29(43), 249–262 (1981)

    MathSciNet  MATH  Google Scholar 

  22. Stevo, T.: A note on the proper forcing axiom. In: Axiomatic set theory (Boulder, CO, 1983), volume 31 of Contemporary Mathematics, pp. 209–218. American Mathematical Society, Providence, RI (1984)

  23. Todorčević, S.: Directed sets and cofinal types. Trans. Am. Math. Soc. 290(2), 711–723 (1985)

    Article  MathSciNet  MATH  Google Scholar 

  24. Todorčević, S.: Partition relations for partially ordered sets. Acta Math. 155(1–2), 1–25 (1985)

    MathSciNet  MATH  Google Scholar 

  25. Todorčević, S.: Special square sequences. Proc. Am. Math. Soc. 105(1), 199–205 (1989)

    Article  MathSciNet  MATH  Google Scholar 

  26. Stevo, T.: Conjectures of Rado and Chang and cardinal arithmetic. In: Finite and Infinite Combinatorics in Sets and Logic (Banff, AB, 1991), volume 411 of NATO Adv. Sci. Inst. Ser. C Math. Phys. Sci., pp. 385–398. Kluwer Academic Publications, Dordrecht (1993)

  27. Velickovic, B., Venturi, G.: Proper forcing remastered. In: Cummings, J., Schimmerling, E. (eds.) Appalachian Set Theory: 2006–2012, London Mathematical Society Lecture Note Series. Cambridge University Press, Cambridge (2013)

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Correspondence to Itay Neeman.

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This material is based upon work supported by the National Science Foundation under Grants No. DMS-1101204 and DMS-1363364, and the Simons Foundation under Simons Fellowship No. 225854.

The material from Definition 3.26 to the end of Section 3 was added in revision in July 2015.

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Neeman, I. Two applications of finite side conditions at \(\omega _2\) . Arch. Math. Logic 56, 983–1036 (2017). https://doi.org/10.1007/s00153-017-0550-y

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