Vadim Georgievich Vizing (Russian: Вади́м Гео́ргиевич Визинг, Ukrainian: Вадим Георгійович Візінг; 25 March 1937 – 23 August 2017)[1] was a Soviet and Ukrainian mathematician known for his contributions to graph theory, and especially for Vizing's theorem stating that the edges of any simple graph with maximum degree Δ can be colored with at most Δ + 1 colors.
After completing his undergraduate studies in mathematics in Tomsk State University in 1959, he began his Ph.D. studies at the Steklov Institute of Mathematics in Moscow, on the subject of function approximation, but he left in 1962 without completing his degree.
[5] After holding various additional positions, he moved to Odessa in 1974, where he taught mathematics for many years at the Academy for Food Technology[2] (originally known as Одесский технологический институт пищевой промышленности им.
М. В. Ломоносова, "Odessa Technological Institute of Food Industry named after Mikhail Lomonosov").
[V74] He also proved a stronger version of Brook's theorem that applies to list coloring.