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  1. Same graph, different universe.Assaf Rinot - 2017 - Archive for Mathematical Logic 56 (7-8):783-796.
    May the same graph admit two different chromatic numbers in two different universes? How about infinitely many different values? and can this be achieved without changing the cardinals structure? In this paper, it is proved that in Gödel’s constructible universe, for every uncountable cardinal \ below the first fixed-point of the \-function, there exists a graph \ satisfying the following:\ has size and chromatic number \;for every infinite cardinal \, there exists a cofinality-preserving \-preserving forcing extension in which \=\kappa \).
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  • The sharp for the Chang model is small.William J. Mitchell - 2017 - Archive for Mathematical Logic 56 (7-8):935-982.
    Woodin has shown that if there is a measurable Woodin cardinal then there is, in an appropriate sense, a sharp for the Chang model. We produce, in a weaker sense, a sharp for the Chang model using only the existence of a cardinal \ having an extender of length \.
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  • Short extenders forcings I.Moti Gitik - 2012 - Journal of Mathematical Logic 12 (2):1250009.
    The purpose of the present paper is to present new methods of blowing up the power of a singular cardinal κ of cofinality ω. New PCF configurations are obtained. The techniques developed here will be used in a subsequent paper to construct a model with a countable set which pcf has cardinality ℵ1.
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