pdf file Recent results on partition regularity of infinite matrices (to appear in Connections in Discrete Mathematics, Cambridge University Press)

pdf file (With K. Pleasant) Preserving integer images of matrices (to appear in Integers)

pdf file Research of Wis Comfort on ultrafilters and the Stone-Cech compactification (to appear in Topology and its Applications)

pdf file (With L. Jones and D. Strauss) The relationships among many notions of largeness for subsets of a semigroup (to appear in Semigroup Forum)

pdf file A history of central sets

pdf file (With D. Strauss) Image partition regularity of matrices over commutative semigroups

pdf file (With D. Strauss) Sets and mappings in beta S which are not Borel

pdf file (With D. Strauss) Some new examples of infinite image partition regular matrices