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  1. On inverse γ-systems and the number of l∞λ- equivalent, non-isomorphic models for λ singular.Saharon Shelah & Pauli Väisänen - 2000 - Journal of Symbolic Logic 65 (1):272 - 284.
    Suppose λ is a singular cardinal of uncountable cofinality κ. For a model M of cardinality λ, let No (M) denote the number of isomorphism types of models N of cardinality λ which are L ∞λ - equivalent to M. In [7] Shelah considered inverse κ- systems A of abelian groups and their certain kind of quotient limits Gr(A)/ Fact(A). In particular Shelah proved in [7, Fact 3.10] that for every cardinal μ there exists an inverse κ-system A such that (...)
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  • Cardinalities of topologies with small base.Saharon Shelah - 1994 - Annals of Pure and Applied Logic 68 (1):95-113.
    Let T be the family of open subsets of a topological space . We prove that if T has a base of cardinality μ, λμ<2λ, λ strong limit of cofinality 0, then T has cardinality μ or 2λ. This is our main conclusion . In Theorem 2 we prove it under some set-theoretic assumption, which is clear when λ = μ; then we eliminate the assumption by a theorem on pcf from [Sh 460] motivated originally by this. Next we prove (...)
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