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目：Onsome of the differences between Z and Z2 in dynamics

间：2019.05.28（星期二）, 15:00--16:00

点：数学院南楼N913

要：Around1970 it was discovered that measure preserving actions of Z2 on probability spaces can have remarkably differentproperties from Z-actions, i.e. from actions of single transformations. Many of these differences can be describedas ‘rigidity phenomena’ and manifest themselves in the scarcity of certain objects for Z2-actions which are abundant for Z-actions: they may have unexpectedly few invariant probability measures, invariant sets, isomorphisms or automorphisms.