This paper may be understood as a continuation of Topsøe’s seminal paper () to characterize,within an abstract setting, compact subsets of finite inner regular measures w.r.t. the weak topology.The new aspect is that neither assumptions on compactness of the inner approximating lattices nor nonsequentialcontinuity properties for the measures will be imposed. As a providing step also a generalizationof the classical Portmanteau lemma will be established. The obtained characterizations of compact subsetsw.r.t. the weak topology encompass several known ones from literature. The investigations rely basicallyon the inner extension theory for measures which has been systemized recently by König (, ,)
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