Title   name
2018 Discrete Math 세미나
  Speaker   Michael Dobbins  
  Date 2018-05-30
  Place KAIST
  File  의 1 번째 Real Media 동영상입니다.
Abstract : In this talk I will present a metric space of pseudosphere arrangements, as in the topological representation theorem of oriented matroids, where each pseudosphere is assigned a weight. This gives an extension of the space of full rank vector configurations of fixed size in a fixed dimension that has nicer combinatorial and topological properties. In rank 3 these spaces, modulo SO(3), are homotopy equivalent to Grassmanians, and the subspaces representing a fixed oriented matroid are contractible. Work on these spaces was partly motivated by combinatorial tools for working with vector bundles.