voula@utcsri.UUCP (Voula Vanneli) (03/13/85)
UNIVERSITY OF TORONTO DEPARTMENT OF COMPUTER SCIENCE (GB = Gailbraith Building, 35 St. George) COMBINATORICS - Wednesday, March 20, 4 pm., GB 244 Professor Anton Kotzig C.R.M.A., University of Montreal 9"Certain Vertex Valuations of Regular Triangulation in the Plane and their Applications"* Abstract The connections between the following topics will be discussed: 1. Zero-one vertex valuations of regular triangulation in the plane. 2. Sparse boolean matrices. 3 Additive permutations of sets of integers and their transformations, invariants, and symmetries. 4. Perfect systems of difference sets.