Abstract
A nilmanifold is a quotient of a connected and simply connected nilpotent Lie group G by a uniform lattice N. In this paper, we determine the Reidemeister and Nielsen number of affine n-valued maps on such a nilmanifold. These are maps for which a given lifting to G splits into n affine maps of the Lie group G. To obtain this result we also establish a way of computing the number of generalized twisted conjugacy classes on finitely generated torsion-free nilpotent groups.
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References
Anosov, D.V.: Nielsen numbers of mappings of nil-manifolds. Uspekhi Mat. Nauk 40(244), 133–134 (1985)
Brown, R.: Fixed points of \(n\)-valued multimaps of the circle. Bull. Pol. Acad. Sci. Math. 54(2), 153–162 (2006)
Brown, R., Deconinck, C., Dekimpe, K., Staecker, P.C.: Lifting classes for the fixed point theory of \(n\)-valued maps. Topol. Appl. 274, 107125 (2020)
Brown, R., Gonçalves, D.: On the topology of \(n\)-valued maps. Adv. Fixed Point Theory 8, 205–220 (2018)
Corwin, L.G., Greenleaf, F.P.: Representations of nilpotent Lie groups and their applications. Part I Cambridge studies in advanced mathematics. Cambridge University Press (1990)
Dekimpe, K.: A users’ guide to infra-nilmanifolds and almost-Bieberbach groups, Handbook of group actions. Vol. III, Adv. Lect. Math. 40, Int. Press of Boston, 215 - 262 (2018)
Dekimpe, K.: Almost-Bieberbach groups: affine and polynomial structures. Springer (1996)
Deré, J., Pengitore, M.: Effective twisted conjugacy separability of nilpotent groups. Math. Z. 292(3–4), 763–790 (2019)
Fadell, E., Husseini, S.: On a theorem of Anosov on Nielsen numbers for nilmanifolds, nonlinear functional analysis and its applications (Maratea, 1985). NATO Adv. Sci. Inst. Ser. C: Math. Phys. Sci. 173, 47–53 (1986)
Fel’shtyn, A., Gonçalves, D., Wong, P.: Twisted conjugacy classes for polyfree groups. Comm. Algebra 42(1), 130–138 (2014)
Gonçalves, D., Wong, P.: Twisted conjugacy classes in nilpotent groups. J. Reine Angew. Math. 633, 11–27 (2009)
Jezierski, J., Marzantowicz, W.: Homotopy methods in topological fixed and periodic points theory, topological fixed point theory and its applications. Springer (2006)
Jiang, B.: A primer of Nielsen fixed point theory, handbook of topological fixed point theory, pp. 617–645. Springer (2005)
Jiang, B.: Lectures on Nielsen fixed point theory. Contemp. Math. (1983). https://doi.org/10.1090/conm/014
Kargapolov, M.I., Merzliakov, J.I.: Fundamentals of the theory of groups, graduate texts in mathematics 62. Springer-Verlag (1979)
Kiang, T.: The theory of fixed point classes. Springer-Verlag, Cham (1989)
Lee, K.B.: Maps on infra-nilmanifolds. Pacific J. Math. 168(1), 157–166 (1995)
Malcev, A. I.: On a class of homogeneous spaces, Amer. Math. Soc. Translation 39 (1951)
Mitra, O., Sankaran, P.: Twisted conjugacy in \({\rm GL}_2\) and \({\rm SL}_2\) over polynomial algebras over finite fields. Geom. Dedicata 216, 2 (2022)
Schirmer, H.: An index and Nielsen number for \(n\)-valued multifunctions. Fund. Math. 121, 201–219 (1984)
Schirmer, H.: Fix-finite approximation of \(n\)-valued multifunctions. Fund. Math. 121(1), 73–80 (1984)
Segal, D.: Polycyclic groups, Cambridge tracts in mathematics. Cambridge University Press (1983)
Senden, P.: Twisted conjugacy in direct products of groups. Comm. Algebra 49(12), 5402–5422 (2021)
Staecker, P. C.: Partitions of \(n-\)valued maps, arXiv:2101.09326 [math.GN] (2021)
Wecken, F.: Fixpunktklassen. III. Mindestzahlen von Fixpunkten. Math. Ann. 118, 544–577 (1942)
Xicoténcatl, M.: Orbit configuration spaces. Contemp. Math. 621, 113–132 (2014)
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The authors would like to thank the anonymous referee for the careful reading of the paper and pointing out some inaccuracies and misprints.
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Deconinck, C., Dekimpe, K. Nielsen numbers of affine n-valued maps on nilmanifolds. J. Fixed Point Theory Appl. 25, 84 (2023). https://doi.org/10.1007/s11784-023-01087-3
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DOI: https://doi.org/10.1007/s11784-023-01087-3