Cellular Automata in Hyperbolic Spaces: implementation and computations. Vol. 2 - Maurice Margenstern - Google Books

http://books.google.de/books?id=eEgvfic3A4kC&pg=PA79&dq=Negafibonacci

The book introduces a hot topic of mathematics and computer science at the edge of hyperbolic geometry and cellular automata. A hyperbolic space is a geometric model where through a given point, there arc two distinct parallels to a given lino. A cellular…