Groups and semigroups
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The main properties of topological groups and semigroups, their characters and semicharacters are outlined in this chapter. Some of the basic features of various spaces of functions, measures and operators on groups are presented too. Semigroup algebras ℓ1(S), introduced at the end of the chapter, are closely related with the underlying semigroups S.
KeywordsIdentity Element Polar Decomposition Dual Group Irrational Number Compact Abelian Group
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