Emanuel Grinberg

Emanuel Grinberg (1911 to 1982), in Latvian Emanuels Grinbergs, was a Latvian mathematician best known for Grinberg's theorem, a necessary condition for a planar graph to contain a Hamiltonian cycle that has often been used to build non-Hamiltonian planar graphs. He was born in St. Petersburg on 25 January 1911 and grew up in Riga after his family returned to Latvia, studying at the University of Latvia and at the Ecole Normale Superieure in Paris. His career was disrupted by the Second World War and the Soviet occupation, after which he worked in a radio factory before returning to the university and then the University of Latvia Computer Center. His research covered geometry, graph theory, electrical circuit design, spline-based ship hull design and operations research.