Invariant Means on Spaces of Continuous or Measurable Functions ( )
نویسنده
چکیده
1. Introduction. Invariant means on spaces of functions have been studied by von Neumann [ 7], Banach [ 2], Day [ 4], [5] and others. Day's Amenable semigroups [5] presents a comprehensive summary of the earlier work and many new results. Let 2 be an abstract group or semigroup and ret (2) the Banach space of all bounded real-valued functions on 2 with the supremum norm. A mean on rei(2) is a positive linear functional of norm one. Left and right translation operators, respectively denoted by
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