Abstract
In this paper we consider two questions in the realm of paratopological groups: When does multiplication on a given Tychonoff paratopological group H admit an extension to continuous multiplication on the Dieudonné completion, \(\mu {H}\), of H in such a way that H turns into a dense subgroup of the paratopological group \(\mu {H}\)? and, if A and B are bounded subsets of paratopological groups G and H, respectively, is \(A\times B\) bounded in \(G\times H\)? The motivation for these questions comes from the field of topological groups and they are receiving a special attention as an interesting source of open problems.
Similar content being viewed by others
References
Arhangel’skii, A.V.: Moscow spaces, Pestov-Tkachenko Problem, and \(C\)-embeddings. Comment. Math. Univ. Carol. 41, 585–595 (2000)
Arhangel’skii, A.V.: Moscow spaces and topological groups. Topol. Proc. 25, 383–416 (2000)
Arhangel’skii, A.V.: Topological groups and \(C\)-embeddings. Topol. Appl. 115, 265–289 (2001)
Arhangel’skii, A.V., Bella, A.: The diagonal of a first countable paratopological group, submetrizability, and related results. Appl. Gen. Topol. 8, 207–212 (2007)
Arhangel’skii, A.V., Tkachenko, M.G.: Topological groups and related structures, Atlantis Studies in Mathematics, vol. 1. Atlantis Press, Paris (2008)
Banakh, T., Ravsky, A.: A characterization of completely regular spaces with applications to paratopological groups. arXiv:1410.1504 [math.GN]. December 3 (2014)
Banakh, T., Ravsky, A.: Each regular paratopological group is completely regular. Proc. Am. Math. Soc. (to appear)
Bernstein, A.R.: A new kind of compactness for topological spaces. Fund. Math. 66, 185–193 (1970)
Comfort, W.W., Ross, K.A.: Pseudocompactness and uniform continuity in topological groups. Pac. J. Math. 16(3), 483–496 (1966)
Engelking, R.: General topology. Heldermann Verlag, Berlin (1989)
Frolík, Z.: Sums of ultrafilters. Bull. Am. Math. Soc. 73, 87–91 (1967)
García-Ferreira, S., Sanchis, M., Tamariz-Mascarúa, A.: On \(C_{\alpha }\)-compact subsets. Topol. Appl. 77, 139–160 (1997)
García-Ferreira, S., Sanchis, M., Watson, S.: Some remarks on the product of two \(C_{\alpha }\)-subsets. Czech. Math. J. 50(125), 249–264 (2000)
Ginsburg, J., Saks, V.: Some applications of ultrafilters in topology. Pac. J. Math. 57, 403–418 (1975)
Glicksberg, I.: Stone-Čech compactifications of products. Trans. Am. Math. Soc. 90, 369–382 (1959)
Hernández, S., Sanchis, M., Tkachenko, M.: Bounded sets in spaces and topological groups. Topol. Appl. 101, 21–43 (2000)
Katĕtov, M.: Characters and types of points sets. Fund. Math. 50, 369–380 (1961)
Katĕtov, M.: Products of filters. Comment. Math. Univ. Carol. 9, 173–189 (1968)
Pontryagin, L.S.: Continuous groups. Princeton Univ. Press, Princeton, New York (1939)
Ravsky, O.: Paratopological groups I. Matem. Stud. 16, 37–48 (2001)
Ravsky, O.: Paratopological groups II. Matem. Stud. 17, 93–101 (2002)
Romaguera, S., Sanchis, M.: Locally compact topological groups and cofinal completeness. J. Lond. Math. Soc. 62, 451–460 (2000)
Sánchez, I.: Cardinal invariants of paratopological groups. Topol. Algebra Appl. 1, 37–45 (2013)
Sánchez, I.: Subgroups of products of paratopological groups. Topol. Appl. 163, 160–173 (2014)
Sánchez, I., Sanchis, M.: \(p\)-Boundedness in paratopological groups. Topol. Appl. 194, 306–316 (2015)
Sánchez, I., Tkachenko, M.: Products of bounded subsets of paratopological groups. Topol. Appl. 190, 42–58 (2015)
Sánchez, I., Tkachenko, M.: \(C\)-compact and \(r\)-pseudocompact subsets of paratopological groups. Topol. Appl. 203, 125–140 (2016). doi:10.1016/j.topol.2015.12.081
Sanchis, M., Tamariz-Mascarúa, A.: \(p\)-pseudocompactness and related topics in topological spaces. Topol. Appl. 98, 323–343 (1999)
Sanchis, M., Tamariz-Mascarúa, A.: On quasi-\(p\)-bounded subsets. Colloq. Math. 80, 175–189 (1999)
Sanchis, M., Tamariz-Mascarúa, A.: A note on \(p\)-bounded and quasi-\(p\)-bounded subsets. Houst. J. Math. 28, 511–527 (2002)
Sanchis, M., Tkachenko, M.G.: Totally Lindelöf and totally \(\omega \)-narrow paratopological groups. Topol. Appl. 155, 322–334 (2008)
Sanchis, M., Tkachenko, M.G.: \(\mathbb{R}\)-factorizable paratopological groups. Topol. Appl. 157, 800–808 (2010)
Sanchis, M., Tkachenko, M. G.: Recent progress in paratopological groups. In: Rodríguez-López, J., Romaguera, S. (eds.) Quaderni Mat., Special Issue: asymmetric topology and its applications, vol. 26, pp. 247–298 (2012)
Sanchis, M., Tkachenko, M.G.: Dieudonné completion and PT-groups. Appl. Categ. Struct. 1, 1–18 (2012)
Tkachenko, M.G.: Compactness type properties in topological groups. Czech. Math. J. 38, 324–341 (1988)
Tkachenko, M.G.: Factorization theorems for topological groups and their applications. Topol. Appl. 38, 21–37 (1991)
Tkachenko, M.G.: Subgroups, quotient groups and products of \({\mathbb{R}}\)-factorizable groups. Topol. Proc. 16, 201–231 (1991)
Tkachenko, M.G.: Introduction to topological groups. Topol. Appl. 86, 179–231 (1998)
Tkachenko, M.G.: Embedding paratopological groups into topological products. Topol. Appl. 156, 1298–1305 (2009)
Tkachenko, M. G.: Paratopological and semitopological groups vs topological groups, Ch. 20. In: Hart, K.P. van Mill, J., Simon, P. (eds.), Recent Progress in General Topology III. Atlantis Press, pp. 825–882 (2014)
Xie, L.-H., Lin, S., Tkachenko, M.G.: Factorization properties of paratopological groups. Topol. Appl. 160, 1902–1917 (2013)
Author information
Authors and Affiliations
Corresponding author
Additional information
Communicated by A. Constantin.
The first author was supported by Universitat Jaume I Grant P1-1B2014-35 and Generalitat Valenciana Grant AICO/2016/030.
Rights and permissions
About this article
Cite this article
Sanchis, M., Tkachenko, M. Completions of paratopological groups and bounded sets. Monatsh Math 183, 699–721 (2017). https://doi.org/10.1007/s00605-016-0953-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00605-016-0953-6
Keywords
- Topological semigroup
- (para)topological group
- Dieudonné completion
- Hewitt realcompactification
- Bounded subset
- Glicksberg’s theorem