Cassius Tocqueville Ionescu Tulcea in occasion of his 90-th Birthday

Abstract

C. T. Ionescu Tulcea is celebrating this year his 90th Birthday. He is joined by the Romanian Mathematical Diaspora and a great number of colleagues from Romania and United States of America, who are sending him their best wishes for a continuous research activity and long life. Professor Ionescu Tulcea was born in Bucharest, Romania, on October 14, 1923. He received his elementary and secondary education in distinguished schools from Bucharest and in 1942 became a student at his Alma Matter, the University of Bucharest, the Faculty of Sciences, Mathematical Section. He graduated from this school in 1946, obtaining his Diploma in Mathematics. The University of Bucharest counted among its Professors some distinguished mathematicians, like Octav Onicescu (Probability Theory), Miron Nicolescu (Mathematical Analysis), Gheorghe Vranceanu (Geometry), Nicolae Theodorescu (Differential Equations), Simion Stoilow (Complex Variables), all of them former students of great mathematicians from France or Italy. During his four years of study at the University of Bucharest, Ionescu Tulcea has acquired a solid training as a research mathematician, not only in classical mathematics, as represented in Europe before the Second World War, but also in the relatively new branches of Topology or Functional Analysis. Following his graduation in 1946, Ionescu Tulcea has been appointed on a position of Assistant at the Chair of Probability Theory and remained with the University of Bucharest for the next 11 years. He has been promoted from the Assistant position to Associate Professor (1951) and to Full Professor (1957), at the Chair of Mathematical Analysis. As a faculty member, Ionescu Tulcea has developed a teaching activity that qualified him as the main promoter of modern mathematics at the Bucharest University, in the field of Modern Analysis. To be more specific, he gave his lectures using Bourbaki’s books and other up to date treatises, which found their place in the programs only after World War II. Moreover, as a research fellow of the Mathematical Institute of the Romanian Academy (1949-1957), Ionescu Tulcea organized seminars on Operator Theory, substantially contributing to a generation of Romanian specialists in this field, among