This is the expanded version of my talk at the workshop "Groups ofAutomorphisms in Birational and Affine Geometry", October 29--November 3, 2012,Levico Terme, Italy. The first section is focused on Jordan groups in abstractsetting, the second on that in the settings of automorphisms groups and groupsof birational self-maps of algebraic varieties. The appendix is the expandedversion of my notes on open problems posted on the site of this workshop. Itcontains formulations of some open problems and the relevant comments.
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