Positively hyperbolic varieties, tropicalization, and positroids
Positively hyperbolic varieties, tropicalization, and positroids
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正双曲线品种、热带化和正类
DOI:
10.1016/j.aim.2021.107677
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发表时间:
2021
影响因子:
1.7
通讯作者:
Yu, Josephine
中科院分区:
文献类型:
--
作者:
Rincón, Felipe;Vinzant, Cynthia;Yu, Josephine
A variety of codimension c in complex affine space is positively hyperbolic if the imaginary part of any point in it does not lie in any positive linear subspace of dimension c. Positively hyperbolic hypersurfaces are defined by stable polynomials. We characterize these varieties using sign variations, and show that they are equivalently defined by being hyperbolic with respect to the positive part of the Grassmannian, in the sense of Shamovich and Vinnikov. Positively hyperbolic projective varieties have tropicalizations that are locally subfans of the type A hyperplane arrangement defined by x i= x j, in which the maximal cones satisfy a non-crossing condition. This gives new proofs of results of Choe–Oxley–Sokal–Wagner and Brändén on Newton polytopes and tropicalizations of stable polynomials. We settle the question of which tropical varieties can be obtained as tropicalizations of positively hyperbolic varieties in the case of tropical toric varieties, constant-coefficient tropical curves, and Bergman fans. Along the way, we give a new characterization of positroids in terms of a non-crossing condition on their Bergman fans.
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影响因子:
0.9
作者:
Mario Kummer;C. Vinzant
通讯作者:
C. Vinzant
影响因子:
1.8
作者:
Mario Kummer;E. Shamovich
通讯作者:
E. Shamovich
DOI:
10.1090/conm/589/11743
发表时间:
2012
期刊:
arXiv: Algebraic Geometry
影响因子:
--
作者:
M. Chan;B. Sturmfels
通讯作者:
B. Sturmfels
影响因子:
1.7
作者:
Braenden, Petter
通讯作者:
Braenden, Petter
影响因子:
1.1
作者:
A. Jensen;H. Markwig;Thomas Markwig
通讯作者:
Thomas Markwig