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math.CO2016
Log-convex and Stieltjes moment sequences
Yi Wang, Bao-Xuan Zhu
We show that Stieltjes moment sequences are infinitely log-convex, which parallels a famous result that (finite) Pólya frequency sequences are infinitely log-concave. We introduce…
math.DG2016
Isoperimetric inequality on CR-manifolds with nonnegative -curvature
Yi Wang, Paul Yang
In this paper, we study contact forms on the three- dimensional Heisenberg manifold with its standard CR structure. We discover that the -curvature, introduced by Branson, Font…