Acta Mathematica Vietnamica

, Volume 44, Issue 4, pp 923–934 | Cite as

On Properties of Expansive Group Actions

  • Ali Barzanouni
  • Mahin Sadat Divandar
  • Ekta ShahEmail author


We study several properties of expansive group actions on metric spaces and obtain some relations between the expansivity for subgroup and group actions. Through counter examples, the necessity of hypothesis is justified. We also study the expansivity of covering maps. Further, we define orbit expansivity for group actions on topological spaces and use it to characterize expansive actions.


Orbit expansive homeomorphism Expansive group actions Syndetic set Subgroups 

Mathematics Subject Classification (2010)

37C85 37C50 37C75 54H20 



Authors takes this opportunity to thank the referee(s) for his or her valuable comments.


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Copyright information

© Institute of Mathematics, Vietnam Academy of Science and Technology (VAST) and Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Department of Mathematics, School of Mathematical SciencesHakim Sabzevari UniversitySabzevarIran
  2. 2.Department of Mathematics, Faculty of ScienceThe Maharaja Sayajirao University of BarodaVadodaraIndia

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