Enrico Betti (1823–1892) taught at the University of Pisa and published on various topics in algebra and analysis. His research on the analysis situs (topology) of hyperspaces led to the definition of the “Betti numbers”, which characterize the connectivity of a manifold. (M 41942) _ _.
Discovered on 18-4-1999 in Prescott by Comba, P. G.