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
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
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.
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.


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
University of Konstanz
Faculty of Mathematics and Computer Science
email: garloff@fh-konstanz.de