A triangle tesselation in the hyperbolic plane, drawn in the

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

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

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

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

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

A triangle tesselation in the hyperbolic plane, drawn in the

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