Order types of random point sets can be realized with small integer coordinates

Abstract

Let S := {p1, . . . , pn} be a set of n points chosen independently and uniformly at random from the unit square and let M be a positive integer. For every point pi = (xi , yi) in S, let p 0 i = (bMxic, bMyic). Let S 0 := {p 0 i : 1 = i = n}. We call S 0 the digitization of S by M. In this paper we study the problem: How large does M have to be such that with high probability, S and S 0 have the same order type?