Preface

Karl Menger (1902–1985) was the mathematician son of the famous economist Carl Menger. He was professor of geometry at the University of Vienna from 1927 to 1938. During that period, which was crucial from a historical and philosophical point of view, he joined the Vienna Circle and founded his Mathematical Colloquium. Menger's memoirs of those Viennese years are recollected in his Reminiscences of the Vienna Circle, appeared in 1994 as the twentieth volume of the Vienna Circle Collection.