Daniel T. Soukup – New aspects of ladder system uniformization II

Talk held by Daniel Soukup (KGRC) at the KGRC seminar on 2018-12-13.

Abstract: We continue the previous lecture and present proofs for some of the new results. We show that $\diamondsuit$ implies that for any Aronszajn-tree $T$, there is a ladder system with a 2-colouring with no $T$-uniformization. However, if $\diamondsuit^+$ holds then for any ladder system $C$ there is an Aronszajn tree $T$ so that any monochromatic colouring of $C$ has a $T$-uniformization (cf. https://arxiv.org/abs/1806.03867).

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