Abstract

AbstractLet G be an infinite discrete group and let βG be the Stone-Čech compactification of G. We take the points of βG to be the ultrafilters on G, identifying the principal ultrafilters with the points of G. The set U(G) of uniform ultrafilters on G is a closed two-sided ideal of βG. For every p ∊ U(G), define Ip ⊆ βG by Ip = ∩ A∊p cl(GU(A)), whereU(A) = {p ∊ U(G) : A ∊ p}. We show that if |G| is a regular cardinal, then {Ip : p ∊ U(G)} is the finest decomposition of U(G) into closed left ideals of βG such that the corresponding quotient space of U(G) is Hausdorff.

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