If A is a set of natural numbers containing 0, then there is a unique nonempty “reciprocal” set A−1 of natural numbers such that every positive integer can be written in the form a+ a′, where a ∈ A… (More)

Suppose that T is an acyclic r-uniform hypergraph, with r ≥ 2. We define the (t-color) chromatic Ramsey number χ(T, t) as the smallest m with the following property: if the edges of any m-chromatic… (More)