Spring 2017

What are High-Dimensional Expanders?

Thursday, February 2nd, 2017 11:40 am12:25 pm

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Quite a few people are trying to answer the question in the title. Various interesting approaches are being proposed based on algebraic, geometric and topological notions. In this talk I will advocate a combinatorial approach that is based on sparsity and regularity and focuses on notions of low discrepancy. This approach makes it particularly desirable to investigate random high-dimensional combinatorial objects.