Hermes, Hans Term logic with choice operator / Hans Hermes - Berlin : Springer-Verlag, 1970 - 55 p. ; 26 cm. - Lecture notes in mathematics a collection of informal reports and seminars ; 6 . Includes index Bibliography : p. 53 ISBN: DM 18.00 Subjects--Topical Terms: Logic, Symbolic and mathematical Dewey Class. No.: 510.82