## Phil Calabrese

Dr. Philip G. Calabrese is the inventor of a successful 4-operation algebra of Boolean fractions, which are like numerical fractions, but with propositions or events rather than whole numbers. These ordered pairs of propositions faithfully represent and support algebraic manipulations of uncertain conditional information, combining deductive logic and conditional probability in a common context, something impossible within the standard logic of Boolean algebra. He has developed the theory of these conditional events and applied them to diverse areas of information, most recently to provide a more natural expression of the logic of quantum measurements.