# Recent and upcoming talks by Paul Ellis

## Paul Ellis: Cycle Reversions and Dichromatic Number in (Infinite) Tournaments

KGRC seminar on 2017-11-16 at 3:30pm Speaker: Paul Ellis (Manhattanville College, New York, USA) Abstract: The dichomatic number for a digraph is the least number of acyclic subgraphs needed to cover the graph. continue reading…

## BEST 2016 slides

The 23rd BEST conference was held June 15–16 in San Diego, CA. Shehzad Ahmed – Jonsson cardinals and pcf theory Liljana Babinkostova – A weakening of the closure operator Kyle Beserra – On the conjugacy problem for automorphisms of countable regular trees Erin Carmody – Killing them softly William Chan – Every analytic equivalence relation with all Borel classes is Borel somewhere John Clemens – Relative primeness of equivalence relations Paul Corazza – The axiom of infinity, quantum field theory, and large cardinals Cody Dance – Indiscernibles for $L[T_2,x]$ Natasha Dobrinen – Ramsey spaces coding universal triangle-free graphs and applications to Ramsey degrees Paul Ellis – A Borel amalgamation property Monroe Eskew – Rigid ideals Daniel Hathaway – Disjoint Borel functions Jared Holshouser – Partition properties for non-ordinal sets under the axiom of determinacy Paul McKenney – Automorphisms of \$\mathcal P(\lambda)/\mathcal I_\kappa Kaethe Minden – Subcomplete forcing and trees Daniel Soukup – Orientations of graphs with uncountable chromatic number Simon Thomas – The isomorphism and bi-embeddability relations for finitely generated groups Douglas Ulrich – A new notion of cardinality for countable first order theories Kameryn Williams – Minimal models of Kelley-Morse set theory Martin Zeman – Master conditions from huge embeddings continue reading…

## BEST 2015 slides

The 22nd BEST conference was held June 14–17 in San Francisco, CA. Mirna Džamonja – FAC and WQO orders and their ordinal invariants Luke Serafin – Cardinal invariants of generalized continua Ari Brodsky – A microscopic approach to higher Suslin tree constructions Ola Kwiatkowska – Dynamics of the homeomorphism group of the Lelek fan Paul Ellis – The conjugacy problem for countable homogeneous structures Trevor Wilson – Covering properties of derived models Miha Habic – Joint Laver diamonds Bill Chen – Scales in Prikry extensions Rodrigo Dias – Productively countably tight spaces and selective games Steven Clontz – Limited information strategies in infinite games Liljana Babinkostova – The selective strong screen ability game Spencer Unger – Baire measurable paradoxical decompositions via matchings Diana Ojeda-Aristizábal – Finite forms of Gowers’ FINk theorem continue reading…