2011 winner, PhD 1971, Applied Mathematics
It was 40 years ago that Ivan defended his PhD thesis in the Department of Applied Mathematics of the University of Waterloo and graduated with a PhD degree. Following his graduation he was appointed as an assistant professor in the Department of mathematics of the Technical university in Bratislava, Slovakia where he stayed till 1980, when he joined the Faculty of Mathematics and Physics of the Comenius University in Bratislava as an associate professor of theoretical physics. In 1989 he became a full professor and one year later the first associate dean of the Faculty of Mathematics and Physics of the Comenius University. Thanks to his continuing efforts to promote the field of quantum chemistry and chemical physics which he chaired until his retirement.
His most significant scientific achievement has been undoubtedly the formulation of the so-called Brillouin-Wigner (BW) Coupled-Cluster (CC) theory enabling the exploitation of CC formalism even for degenerate and quasi-degenerate systems. The CC theory – largely developed at Waterloo – enables a reliable and accurate description of the molecular electronic structure and is nowadays referred to as “the gold standard” of Quantum Chemistry. Its BW version then represents its important variant which is widely exploited and quoted. Recently, Professor Hubac co-authored a monograph on this subject published by Springer Verlag.