supported by the National Natural Science Foundation of China(No.11871266);the Priority Academic Program Development of Jiangsu Higher Education Institutions。
The authors prove that a 3-dimensional small cover M is a Haken manifold if and only if M is aspherical or equivalently the underlying simple polytope is a flag polytope.In addition,they find that M being Haken is als...
Partially supported by the NSFC(Grant No.11971112);the China Scholarship Council(Grant No.202106100095)。
In this paper we study the cubical stuctures and fundamental groups of real toric spaces.We give an explicit presentation of the fundamental group of the real toric space over a simple polytope.Then using this present...
supported by the Samsung Science and Technology Foundation(Grant No. SSTF-BA1602-03);supported by the National Research Foundation of Korea (Grant No. NRF-2019R1F1A1058962);supported by National Natural Science Foundation of China (Grant Nos. 11771455, 11822113 and 11831017);Guangdong Introducing Innovative and Enterpreneurial Teams (Grant No. 2017ZT07X355)。
We study the toric degeneration of Weyl group translated Schubert divisors of a partial flag variety F?_(n1,...,nk;n) via Gelfand-Cetlin polytopes. We propose a conjecture that Schubert varieties of appropriate dimens...
supported by Major Projects for Science and Technology Innovation 2030(Grant No.2018AA0100800);Equipment Pre-research Foundation of Laboratory(Grant No.61425040104);in part by Jiangsu Province“333”project under Grant BRA2019051.
Game theory can be applied to the air combat decision-making problem of multiple unmanned combat air vehicles(UCAVs).However,it is difficult to have satisfactory decision-making results completely relying on air comba...
The logarithmic capacitary Minkowski problem asks for necessary and sufficient conditions on a finite Borel measure on the unit sphere so that it is the logarithmic capacitary measure of a convex body.This article com...
supported by National Natural Science Foundation of China(Grant Nos.11822102 and 11421101);supported by Beijing Academy of Artificial Intelligence(BAAI);supported by the project funded by China Postdoctoral Science Foundation(Grant No.BX201700009)。
Existing critical point theories including metric and topological critical point theories are difficult to be applied directly to some concrete problems in particular polyhedral settings,because the notions of critica...
supported by National Natural Science Foundation of China(Grant Nos.11631013 and 11331012);the National Basic Research Program of China(Grant No.2015CB856002);the Major Project to Promote Development of Big Data from National Development and Reform Commission(Grant No.2016-999999-65-01-000696-01)。
The well-known sequentially lifted cover inequality is widely employed in solving mixed integer programs.However,it is still an open question whether a sequentially lifted cover inequality can be computed in polynomia...
supported by National Natural Science Foundation of China(Grant Nos.11571186,11701411,11801580 and 11871284)。
In this paper,we study the topology of moment-angle manifolds and prove a conjecture of S.Gitler and S.Lopez de Medrano concerned with the behavior of the moment-angle manifold under the surgery’cutting off a vertex...
Let π : Mn→Pn be an n-dimensional small cover over Pn and λ : F(Pn)→Z2n be its characteristic function. The author uses the symbol c(λ) to denote the cardinal number of the image Im(λ). If c(λ) = n + 1 or n + 2...
The authors would like to thank two anonymous referees for their valuable comments and suggestions.The author Yu-hong Dai is supported by the Chinese Natural Science Foundation(Nos.11631013,71331001 and 11331012);the National 973 Program of China(No.2015CB856002);The author Fengmin Xu is supported by the Chinese NSF grants(Nos.11571271,11631013 and 11605139).
In this paper we propose an efficient and robust method for computing the analytic center of the polyhedral set P={x€R^n|Ax=b,x>0},where the matrix A€ Rm×n is ill-conditioned,and there are errors in A and b.Besides o...