A triangle tesselation in the hyperbolic plane, drawn in the

William GOLDMAN, Professor (Full), Ph.D., University of Maryland, College Park, MD, UMD, UMCP, University of Maryland College Park, Department of Mathematics

Envelopes in S 2 , sketched in the plane: (a) Local configuration of

A triangle tesselation in the hyperbolic plane, drawn in the

A regular right-angled octagon can also be realized in the tiling of H

A triangle tesselation in the hyperbolic plane, drawn in the

A triangle tesselation in the hyperbolic plane, drawn in the

William GOLDMAN, Professor (Full), Ph.D., University of Maryland, College Park, MD, UMD, UMCP, University of Maryland College Park, Department of Mathematics

Envelopes in S 2 , sketched in the plane: (a) Local configuration of

William GOLDMAN, Professor (Full), Ph.D., University of Maryland, College Park, MD, UMD, UMCP, University of Maryland College Park, Department of Mathematics

William GOLDMAN, Professor (Full), Ph.D., University of Maryland, College Park, MD, UMD, UMCP, University of Maryland College Park, Department of Mathematics

Envelopes in S 2 , sketched in the plane: (a) Local configuration of