报告题目：On the geometry of the countably branching diamond graphs
报告摘要：The geometry of the 2-branching diamond graphs has been proved to be fundamental in connection with theoretical computer science. On the other hand, in Banach space theory, the property of superreflexivity can be characterized by the non-embeddability of the 2-branching diamond graphs. In this talk we will discuss the bi-Lipschitz embeddability of the countably branching diamond graphs into Banach spaces with certain asymptotic properties. The results are part of a joint paper with various mathematicians.