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A Note on Quaternionic Hyperbolic Ideal Triangle Groups
Published online by Cambridge University Press: 20 November 2018
Abstract
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In this paper, the quaternionic hyperbolic ideal triangle groups are parametrized by a real one-parameter family 
$\{{{\phi }_{s}}\,:\,s\,\in \,\mathbb{R}\}$ . The indexing parameter s is the tangent of the quaternionic angular invariant of a triple of points in 
$\partial \mathbf{H}_{\mathbb{H}}^{2}$ forming this ideal triangle. We show that if 
$s>\sqrt{125/3},$ then 
${{\phi }_{S}}$ is not a discrete embedding, and if 
$s\,\le \,\sqrt{3\text{5}}$ , then ${{\phi }_{S}}$ is a discrete embedding.
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