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Describing free groups

Authors: J. Carson, V. Harizanov, J. Knight, K. Lange, C. McCoy, A. Morozov, S. Quinn, C. Safranski and J. Wallbaum
Journal: Trans. Amer. Math. Soc. 364 (2012), 5715-5728
MSC (2010): Primary 03C57
Published electronically: June 21, 2012
MathSciNet review: 2946928
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Abstract: We consider countable free groups of different ranks. For these groups, we investigate computability theoretic complexity of index sets within the class of free groups and within the class of all groups. For a computable free group of infinite rank, we consider the difficulty of finding a basis.

References [Enhancements On Off] (What's this?)

  • C. J. Ash and J. Knight, Computable structures and the hyperarithmetical hierarchy, Studies in Logic and the Foundations of Mathematics, vol. 144, North-Holland Publishing Co., Amsterdam, 2000. MR 1767842
  • M. Bestvina and M. Feighn, “Definable and negligible subsets of free groups”, in process.
  • V. Kalvert, V. S. Kharizanova, D. F. Naĭt, and S. Miller, Index sets of computable models, Algebra Logika 45 (2006), no. 5, 538–574, 631–632 (Russian, with Russian summary); English transl., Algebra Logic 45 (2006), no. 5, 306–325. MR 2307694, DOI
  • D. Grove and M. Culler, personal correspondence.
  • Olga Kharlampovich and Alexei Myasnikov, Elementary theory of free non-abelian groups, J. Algebra 302 (2006), no. 2, 451–552. MR 2293770, DOI
  • Roger C. Lyndon and Paul E. Schupp, Combinatorial group theory, Classics in Mathematics, Springer-Verlag, Berlin, 2001. Reprint of the 1977 edition. MR 1812024
  • A. I. Mal′cev, On the equation $zxyx^{-1}y^{-1}z^{-1}= aba^{-1}b^{-1}$ in a free group, Algebra i Logika Sem. 1 (1962), no. 5, 45–50 (Russian). MR 0153726
  • C. McCoy and J. Wallbaum, “Describing free groups, Part II: $\Pi ^0_4$ hardness and no $\Sigma ^0_2$ basis”, Tran. Amer. Math. Soc., this issue.
  • G. Metakides and A. Nerode, Effective content of field theory, Ann. Math. Logic 17 (1979), no. 3, 289–320. MR 556895, DOI
  • Anand Pillay, On genericity and weight in the free group, Proc. Amer. Math. Soc. 137 (2009), no. 11, 3911–3917. MR 2529900, DOI
  • Bruno Poizat, Groupes stables, avec types génériques réguliers, J. Symbolic Logic 48 (1983), no. 2, 339–355 (French). MR 704088, DOI
  • Dana Scott, Logic with denumerably long formulas and finite strings of quantifiers, Theory of Models (Proc. 1963 Internat. Sympos. Berkeley), North-Holland, Amsterdam, 1965, pp. 329–341. MR 0200133
  • Z. Sela, series of papers, “Diophantine geometry over groups I: Makanin-Razborov diagrams”, Publications Mathématiques, Institute des Hautes Études Scientifiques, vol. 93 (2001), pp. 31–105; Diophantine geometry over groups II: Completions, closures, and formal solutions”, Israel J. of Math., vol. 134 (2003), pp. 173–254; Z. Sela, “Diophantine geometry over groups III: Rigid and solid solutions”, Israel J. of Math. , vol. 147 (2005), pp. 1–73; “Diophantine geometry over groups IV: An iterative procedure for validation of a sentence”, Israel J. of Math., vol. 143 (2004), pp. 1–130; “Diophantine geometry over groups V$_{1}$: Quantifier elimination I”, Israel J. of Math. , vol. 150 (2005), pp. 1–197; “Diophantine geometry over groups V$_{2}$: Quantifier elimination II”, Geometric and Functional Analysis, vol. 16 (2006), pp. 537–706; “Diophantine geometry over groups VI: The elementary theory of a free group”, Geometric and Functional Analysis, vol. 16 (2006), pp. 707–730.
  • R. Sklinos, “On the generic type of the free group”, to appear in the Journal of Symbolic Logic.

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Additional Information

J. Carson
Affiliation: Department of Mathematics, University of Notre Dame, Notre Dame, Indiana 46556

V. Harizanov
Affiliation: Department of Mathematics, George Washington University, Washington, DC 20052

J. Knight
Affiliation: Department of Mathematics, University of Notre Dame, Notre Dame, Indiana 46556
MR Author ID: 103325

K. Lange
Affiliation: Department of Mathematics, Wellesley College, Wellesley, Massachusetts 02482

C. McCoy
Affiliation: Department of Mathematics, University of Portland, Portland, Oregon 97203
MR Author ID: 695683

A. Morozov
Affiliation: Sobolev Mathematical Institute, Russian Academy of Sciences, Novosibirsk 630090 Russia

S. Quinn
Affiliation: Department of Mathematics, Dominican University, River Forest, Illinois 60305

C. Safranski
Affiliation: Department of Mathematics, Saint Vincent College, Latrobe, Pennsylvania 15650

J. Wallbaum
Affiliation: Department of Mathematical Sciences, Eastern Mennonite University, Harrisonburg, Virginia 22802

Received by editor(s): July 1, 2009
Received by editor(s) in revised form: August 25, 2010
Published electronically: June 21, 2012
Additional Notes: The authors acknowledge partial support under NSF Grant # DMS-0554841. The second author also received partial support under NSF Grant # DMS-0904101
Article copyright: © Copyright 2012 American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.