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1 results

  • INFINITE COMBINATORICS PLAIN AND SIMPLE

  • DÁNIEL T. SOUKUP, LAJOS SOUKUP
  • Journal:
    The Journal of Symbolic Logic / Volume 83 / Issue 3 / September 2018
    Published online by Cambridge University Press:
    23 October 2018, pp. 1247-1281
    Print publication:
    September 2018

  • We explore a general method based on trees of elementary submodels in order to present highly simplified proofs to numerous results in infinite combinatorics. While countable elementary submodels have been employed in such settings already, we significantly broaden this framework by developing the corresponding technique for countably closed models of size continuum. The applications range from various theorems on paradoxical decompositions of the plane, to coloring sparse set systems, results on graph chromatic number and constructions from point-set topology. Our main purpose is to demonstrate the ease and wide applicability of this method in a form accessible to anyone with a basic background in set theory and logic.