Rank Gradient and p-gradient of Amalgamated Free Products and HNN Extensions |
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| Authors: | Nathaniel Pappas |
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| Affiliation: | 1. University of Virginia , Charlottesville , Virginia , USA nrp6r@virginia.edu |
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| Abstract: | We calculate the rank gradient and p-gradient of free products with amalgamation over an amenable subgroup and HNN extensions with an amenable associated subgroup. The notion of cost is used to compute the rank gradient of amalgamated free products and HNN extensions. For the p-gradient the Kurosh subgroup theorems for amalgamated free products and HNN extensions will be used. |
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| Keywords: | Amenable Amalgamated free product Cost HNN extension p-gradient Profinite group Rank gradient |
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