PROVIDENCE, Rhode Island, Feb. 4 -- The American Mathematical Society issued the following news release: * * * Vinzant, Colleagues Awarded NAS Held Prize Nima Anari, Stanford University, Kuikui Liu, Massachusetts Institute of Technology, and Shayan Oveis Gharan and Cynthia Vinzant, University of Washington, will receive the Michael and Sheila Held Prize from the National Academy of Sciences (NAS) for breakthrough work advancing the theory of matroids and mixing rates of Markov chains. A Fell  more