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4 papers · 1 filter
Homotopy sphere representations for matroids
Laura Anderson
For any rank oriented matroid , a construction is given of a "topological representation" of by an arrangement of homotopy spheres in a simplicial complex which is homot…
How do Wireless Chains Behave? The Impact of MAC Interactions
Saquib Razak, Vinay Kolar, Nael B. Abu-Ghazaleh +1
In a Multi-hop Wireless Networks (MHWN), packets are routed between source and destination using a chain of intermediate nodes; chains are a fundamental communication structure in…
Differential Harnack inequalities on Riemannian manifolds I : linear heat equation
Junfang Li, Xiangjin Xu
In the first part of this paper, we get new Li-Yau type gradient estimates for positive solutions of heat equation on Riemmannian manifolds with , .…
Obstructions to Fibering a Manifold
F. T. Farrell, Wolfgang Lück, Wolfgang Steimle
Given a map f: M \to M of closed topological manifolds we define torsion obstructions whose vanishing is a necessary condition for f being homotopy equivalent to a projection of a…