Existence of optimal ultrafilters and the fundamental complexity of simple theories. Malliaris, M. & Shelah, S. Advances in Mathematics. arxiv:math.LO/1404.2919
bibtex   
@article{MiSh:1030,
author = {Malliaris, Maryanthe and Shelah, Saharon},
trueauthor = {Malliaris, Maryanthe and Shelah, Saharon},
fromwhere = {1,IL},
journal = {Advances in Mathematics},
note = { arxiv:math.LO/1404.2919 },
title = {{Existence of optimal ultrafilters and the fundamental
 complexity 	of simple theories}},
volume = {accepted},
}

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