**Beiträge zur Algebra und Geometrie <BR> Contributions to Algebra and GeometryVol. 40, No. 2, pp. 475-477 (1999)
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The Maximum Number of Unit Distances Among $n$ Points in Dimension Four

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Paul van Wamelen

Department of Mathematics, Louisiana State University, Baton Rouge, LA 70803-4918, U.S.A., e-mail: wamelen@math.lsu.edu

**Abstract:** We complete P. Brass' determination of the maximum number of unit distances that can occur among $n$ points in dimension $4$.

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