Infinitely often and almost always

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Let A1,A2,A3, be a sequence of events in some sample space Ω.

perspective infinitely often almost always
unions and intersections ωN=1n=NAn ωN=1n=NAn
first-order quantifiers N1nN:ωAn N1nN:ωAn
verbal expression ωAn for infinitely many n1 ωAn for almost all n1, i.e. ωAn for all but finitely many n1, i.e. ωAn for finitely many n1
lim sup/lim inf ωlim supnAn ωlim infnAn
limit of sup/inf ωlimNsupnNAn ωlimNinfnNAn