KARL NICKEL WILL TURN 75 On February 9, 1999, Professor Dr. Karl Nickel will turn 75. Professor Nickel began his academic career with his famous papers on the solution of aerodynamic problems and his fundamental works on boundary layer theory. With his early paper "Ueber die Notwendigkeit einer Fehlerschranken-Arithmetik", Numer. Math. vol.9, pp.69-79, 1966, he became the first in Germany to work on interval computations. While a professor at the Universities of Karlsruhe and Freiburg i. Br. he - wrote over 40 papers on interval mathematics and related problems; - founded the 'Interval Library' at the University of Karlsruhe which was continued at the University of Freiburg and which contained finally over 2000 contributions from interval mathematics and related fields; - was the founder and editor of the 'Freiburger Intervall-Berichte' which served for ten years (1978 - 87) as a preprint series and as a forum for the 'grey' literature on interval mathematics; - organized three international conferences on interval mathematics: one at the University of Karlsruhe (1975) and two at the University of Freiburg (1980 and 1985). By these activities he contributed enormously to the propagation of the ideas of interval mathematics. I by myself remember gratefully the lively and stimulating discussions at the Institute for Applied Mathematics of the University of Freiburg at that time. During the last decade he has returned to aviation: He has spent much effort on the development of ultralight airplanes and is an enthusiastic pilot of motor gliders. His present address is: Schlierbergstr. 88 D-79100 Freiburg i. Br. Germany Tel: +49-761-403159 On the occasion of his 75th birthday the Faculty of Mathematics of the University of Freiburg will organize a colloquium on February 9 in the Hoersaal Virologie, Hermann-Herder-Str. 11. Program: 15.30 Opening by the Dean of the Faculty for Mathematics Professor Dr. Ludger Rueschendorf 15.45 Professor Dr. Ruediger Verfuerth, Bochum Adaptive Finite Elements Methods (in German) coffee break 17.15 Professor Ph.D. Egon Krause, Aachen Numerical Simulation of Flows around Delta Wings with Parabolized Navier-Stokes Equations (in German) dinner in the restaurant of the Hotel Kolpinghaus May he have further important results in all areas of his interests! Juergen Garloff University of Applied Sciences/ FH Konstanz Department of Computer Science and University of Konstanz Faculty of Mathematics and Computer Science email: garloff@fh-konstanz.de