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arxiv: 1702.08200 · v2 · pith:U5LMPXANnew · submitted 2017-02-27 · 🧮 math.GR · math.GT

Generalized triangle groups, expanders, and a problem of Agol and Wise

classification 🧮 math.GR math.GT
keywords wiseagolgroupstriangleansweringaskedbuiltconstructed
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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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