Barry N. Rackner

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Hejhal was supported in part by NSF Grant DMS 89-10744 and by the Minnesota Supercomputer Institute (with CPU time on the Cray-2 and Cray-XMP). This paper is an expanded version of Hejhal's lecture at the Workshop on Discrete Groups, Number Theory and Ergodic Theory held at MSRI in November 1991. This article provides a glimpse into “arithmetical quantum(More)
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