Roy Dyckhoff

Roy Dyckhoff (March 4, 1948 – August 23, 2018) was a British mathematician, logician and computer scientist who worked in logic and proof theory in the Department of Pure Mathematics and later Computer Science at the University of St Andrews. He is most well known for his discovery in 1992 of a terminating sequent calculus for intuitionistic propositional logic. His Erdős number was 3. Provided by Wikipedia