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math.KT2010
Higher index theory for certain expanders and Gromov monster groups II
Rufus Willett, Guoliang Yu
In this paper, the second of a series of two, we continue the study of higher index theory for expanders. We prove that if a sequence of graphs has girth tending to infinity, then…
math.KT2010
Higher index theory for certain expanders and Gromov monster groups I
Rufus Willett, Guoliang Yu
In this paper, the first of a series of two, we continue the study of higher index theory for expanders. We prove that if a sequence of graphs is an expander and the girth of the g…