Dec 18, 2013 Social choice theory is the study of collective decision processes and procedures. It is not a single theory, but a cluster of models and results concerning the aggregation of individual inputs (e.g., votes, preferences, judgments, welfare) into collective outputs (e.g., collective decisions, preferences, judgments, welfare). Dee definition, a metal loop attached to tack, for fastening gear: The wire cutters hung from a dee on her saddle. Gregory Maxwell 'Max' Kelly (5 June 1930 – 26 January 2007) is a mathematician who worked on category theory. Kelly was born in Bondi, New South Wales, Australia, on 5 June 1930. He obtained his PhD at Cambridge University in homological algebra in 1957, publishing his first paper in that area in. We would like to show you a description here but the site won’t allow us. After that show ended, she went on to graduate Summa cum Laude from UCLA with a degree in Mathematics, and even proved a new math theorem, the Chayes-McKellar-Winn Theorem. Since returning to acting, Danica became familiar again to audiences from her year-long turn as the sardonic, dry-witted Elsie Snuffin on The West Wing (1999) in its 4th season.