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A criterion for the half-plane property

By David G. Wagner and Yehua Wei


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]

Topics: multiaffine then Z = Ze + yeZe for any e ∈ E, and it follows that
Year: 2007
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