A dependent theory with few indiscernibles

preprint2013arXivOpen access

Abstract

We give a full solution to the question of existence of indiscernibles in dependent theories by proving the following theorem: for every θθ there is a dependent theory TT of size θθ such that for all κκ and δδ, κ→(δ)T,1κ\to\left(δ\right)_{T,1} iff κ→(δ)θ<ωκ\to\left(δ\right)_θ^{<ω}. This means that unless there are good set theoretical reasons, there are large sets with no indiscernible sequences.

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