Herbert Gajewski

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Herbert Gajewski (born July 13, 1939 in Berlin ; † December 11, 2019 there ) was a German mathematician .

Life

Gajewski was born in Berlin as the son of a stove fitter and grew up in the Berlin-Prenzlauer Berg district . First he wanted to be a craftsman, then a teacher. During the admission interview at the university, however, he was persuaded to study mathematics. Gajewski studied mathematics at the Humboldt University in Berlin until 1962 . After completing his studies, he began his work at the "Institute for Mathematics and Mechanics" of the Academy of Sciences of the GDR (later: Central Institute for Mathematics and Mechanics, ZIMM, from 1992: Weierstrass Institute for Applied Analysis and Stochastics , WIAS). Here he researched the optimization of chemical reactions. His results were used in the Schwedt chemical plant to optimize paraffin extraction and the production of detergents from petroleum.

Gajewski received his doctorate in 1966 with Kurt Schröder with a thesis on the topic of some constructive approximation methods in non-linear elasticity and plasticity theory . 1970 habilitation Gajewski with a thesis on About direct methods for solving nonlinear variational problems and their application to problems of plasticity theory . In 1977 Gajewski became academy professor at the mathematics institute of the AdW of the GDR.

Gajewski and his working group were involved in the development of microelectronics in the GDR. The movements of the charged particles in the electric field, like the chemical processes, can be modeled with the so-called drift-diffusion equations . Gajewski's group succeeded in analyzing these equations and developing algorithms to solve them. These tests are also useful for applications in medicine. If you x-ray parts of the body with laser beams instead of X-rays, images that are not rich in contrast arise. The drift-diffusion equations can be used to give these images greater contrast.

After the fall of the Berlin Wall in 1989, in April 1990 a vote of confidence took place among the WIAS staff on the institute management. In this vote, the previous director Klaus Matthes was appointed director of the institute. Gajewski was elected as his deputy. He replaced Heinz Ahrens, who had previously been deputy institute director for many years.

Later, Gajewski was provisionally appointed head of WIAS. He held this office until September 1993. In 2004 he retired.

Research topics

Gajewski's main research areas were applied analysis , nonlinear operator equations , nonlinear operator differential equations and methods for their solution.

Arno Langenbach , a student of Solomon Grigorjewitsch Michlin and Sergei Lwowitsch Sobolew , came to the Humboldt University under Rector Kurt Erich Schröder . Against the resistance of the pure mathematicians, he introduced applied analysis in Sobolev spaces . Gajewski together with Konrad Gröger used the Sobolev and Hilbert space theory in their research and developed them.

Gajewski headed the Partial Differential Equations Research Group until 2004 and the Partial Differential Equations and Variational Equations Research Group until 2005 .

Memberships

From June 13, 1985 to July 7, 1992 Gajewski was a corresponding member of the Academy of Sciences of the GDR (since August 1, 1992: Berlin-Brandenburg Academy of Sciences ).

Honors

In 1972 Gajewski received the national prize of the GDR, 2nd class, for science and technology for his exemplary achievements in the mathematical modeling and optimization of modern material separation processes based on adsorption and desorption processes .

In 1993 Gajewski was awarded the Karl Heinz Beckurts Prize . The award ceremony recognized the fact that Gajewski developed techniques for mathematical modeling, for analytical treatment and for numerical simulation of scientific and technical processes. These techniques can be used in science and industry to design electronic components.

Publications

  • Herbert Gajewski, Jens André Griepentrog, Alexander Mielke , J. Beuthan, U. Zabarylo, O. Minet: Image segmentation for the examination of scattered light images in the laser-optical diagnosis of rheumatoid arthritis , Mathematics - Key Technology for the Future, W. JÄGER, H.- J. KREBS, eds., Springer, Heidelberg, 2008, german version “Image Segmentation for the Investigation of Scattered-Light Images when Laser-Optically Diagnosing Rheumatoid Arthritis”, pp. 149–161. on-line
  • Herbert Gajewski, Igor V. Skrypnik: On unique solvability of nonlocal drift-diffusion type problems , Nonlinear Anal., 56 (2004) pp. 803-830. on-line
  • Herbert Gajewski, Hans-Christoph Kaiser, Hartmut Langmach, Reiner Nürnberg, Rainer H. Richter: Mathematical modeling and numerical simulation of semiconductor detectors , Mathematics - Key Technology for the Future. Joint Projects Between Universities and Industry, W. Jaeger, H.-J. Krebs, Ed., Springer-Verlag Berlin Heidelberg, 2003, pp. 355-364 online
  • Herbert Gajewski, Konrad Gröger : Reaction-diffusion processes of electrically charged species , Math. Nachr., 177 (1996), pp. 109-130. ( online )
  • Herbert Gajewski, Konrad Gröger: On the basic equations for carrier transport in semiconductors , Berlin: Inst., Akad., 1984.
  • Herbert Gajewski, Konrad Gröger, Klaus Zacharias: Nonlinear operator equations and operator differential equations , Berlin, Akad.-Verl., 1974
  • Herbert Gajewski, Reinhard Kluge : Projection method for nonlinear variation inequalities , 1970, online

Web links

Individual evidence

  1. ^ H. Gajewski passed away. Retrieved December 16, 2019 .
  2. ^ A b Historical academy members: Herbert Gajewski at bbaw.de. Retrieved August 2, 2019.
  3. ^ Ceremonial colloquium on the occasion of the 75th birthday of Prof. Dr. Herbert Gajewski at wias. Retrieved August 2, 2019.
  4. ↑ a b Stayed true to applied mathematics - Prof. Herbert Gajewski will soon be retiring from fv-berlin. Retrieved August 4, 2019.
  5. ^ Herbert Gajewski at Mathematics Genealogy Project. Retrieved August 3, 2019.
  6. ↑ Habilitation at worldcat. Retrieved August 4, 2019.
  7. ^ Full professors of the GDR at mathematik.hu-berlin.de. Retrieved August 5, 2019.
  8. ↑ WIAS history at wias. Retrieved August 2, 2019.
  9. ↑ a b WIAS history at wias. Retrieved August 2, 2019.
  10. ↑ Kurt Erich Schröder (1909–1978) by Günter Bärwolff at math.berlin. Retrieved August 1, 2019.
  11. ↑ Neues Deutschland edition of: October 7, 1972, pages 5 and 6.
  12. ↑ Prof. Dr. Herbert Gajewski at beckurts-stiftung.de. Retrieved August 2, 2019.
personal data
SURNAME Gajewski, Herbert
BRIEF DESCRIPTION German mathematician
DATE OF BIRTH July 13, 1939
PLACE OF BIRTH Berlin
DATE OF DEATH December 11, 2019
Place of death Berlin