Description |
Abstract: In this talk we will associate two numbers, the geometric and
homological stretch factors, to a graph map and see under what conditions
they are equal. We will then upgrade these notions to free group
automorphisms. Finally, we will cast these numbers in terms of two
polynomial invariants, the Alexander polynomial and McMullen polynomial,
associated to a free-by-cyclic group and see how these polynomials are
related to each other.
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YouTube live link: https://youtu.be/DJQy9fZ8lro
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