Keywords: Dickson hyperbola9.svg Dickson's lemma every set of non-negative integer points has a finite subset of minimal points In this example the set of points above a hyperbola x y xy ‰¥ 9 has five minimal points shown in red 2013-07-25 12 03 34 own David Eppstein cc-zero Uploaded with UploadWizard Combinatorics Files by User David Eppstein from en |