1. Growth functions for semi-regular tilings of the hyperbolic plane

   • W. J. Floyd
   • S. P. Plotnick

   OriginalPaper Pages: 1 - 23

2. Affine differential geometry of surfaces in ℝ⁴

   • Joel L. Weiner

   OriginalPaper Pages: 25 - 48

3. Unions of orthogonally convex or orthogonally starshaped polygons

   • Marilyn Breen

   OriginalPaper Pages: 49 - 56

4. Commuting dual billiard maps

   • Serge Tabachnikov

   OriginalPaper Pages: 57 - 68

5. Arbres, espaces ultramétriques et bases de structure uniforme

   • Francis Choucroun

   OriginalPaper Pages: 69 - 74

6. Minimal sphere bundles in Euclidean spheres

   • Claudio Gorodski

   OriginalPaper Pages: 75 - 102

7. On completeness of certain families of semi-Riemannian manifolds

   • Alfonso Romero
   • Miguel Sánchez

   OriginalPaper Pages: 103 - 117