Thesis: Right and left Cancellation Operations in Order Types.
Ph.D. 1969 at the Hebrew University, Jerusalem.
Thesis: Polyhedral Realization in 3-d of Triangulations of the Torus and 2-manifolds in Convex 4-Polytopes.
Supervisor: Prof. H. Furstenberg.
Main interests: Convex Polytopes, Topological Graph Theory
Recent research students: Gershon Hanoch just completed his Ph.D. on the problem of preassigning links for low-dimensional pseudomanifolds. Ora Adler just completed her M. Sc. thesis on Comparison of Bolyai's and Lobatchevski's approaches to non-Euclidean Geometry.
2. Construction and Representation of Neighborly Manifolds. J. Comb. Th. Ser. A.77 (1997) pp. 246-267.