On Applications of Topological and Combinatorial Methods to the Theory of Groups
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Graphs are topological objects called 1-dimensional CW complexes, and their fundamental groups are free groups. More generally, any group can be represented by a 2-dimensional CW complex, which is a graph with discs glued along the boundaries of closed paths corresponding to relations in the group. These objects can be studied from the topological viewpoint of covering space theory, introduced by John R. Stallings, which allows us to "visualize" groups and determine their subgroup structure. Alternatively, graphs can be studied from a combinatorial point of view, developed by Ilya Kapovich and Alexei Myasnikov, which provides simple algorithms that answer questions about free groups. We give an exposition of both approaches and demonstrate how they are used to answer questions about subgroups of free groups and free products.
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Copyright © 2022 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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- 2022
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santean-onapplicationsoftopologicalandcombinatorial.pdf | 2023-05-05 | Public | Download |