Generalized triangle groups, expanders, and a problem of Agol and Wise (Q2416398)
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| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Generalized triangle groups, expanders, and a problem of Agol and Wise |
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Generalized triangle groups, expanders, and a problem of Agol and Wise (English)
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23 May 2019
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Summary: Answering a question asked by Agol and Wise, we show that a desired stronger form of Wise's malnormal special quotient theorem does not hold. The counterexamples are generalizations of triangle groups, built using the Ramanujan graphs constructed by Lubotzky-Phillips-Sarnak.
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expanders
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virtually special groups
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combinatorial Dehn filling
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