%0 Journal Article %T A criterion for the half-plane property %A David G. Wagner %A Yehua Wei %J Mathematics %D 2007 %I arXiv %X We establish a convenient necessary and sufficient condition for a multiaffine real polynomial to be stable, and use it to verify that the half-plane property holds for seven small matroids that resisted the efforts of Choe, Oxley, Sokal, and Wagner [5]. %U http://arxiv.org/abs/0709.1269v1