Hagen Neidhardt

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Hagen Neidhardt, 2015

Hagen Ernst Neidhardt (born November 20, 1950 in Gefell , Thuringia , † March 23, 2019 in Berlin ) was a German mathematician who mainly worked in the field of operator theory and scattering theory .

family

Hagen Neidhardt's father was director at the engineering school for textile technology (University) Reichenbach / Vogtland , and his mother worked as a clerk in the Vogtlandstoffe company . Neidhardt had a daughter from his first marriage and two daughters as well as a stepson from his second marriage with the qualified pharmacist (GDR) Hiltrud Neidhardt.

Neidhardt lived in Berlin-Pankow .

education

Neidhardt's special talent and inclination for mathematics was recognized early on by his parents and teachers. He attended the Polytechnic High School in Gefell from 1957 to 1967, as well as the Extended High Schools in Schleiz and Reichenbach. In 1967 he switched to the Workers and Farmers Faculty (ABF) of the Martin Luther University in Halle-Wittenberg for two years in preparation for studying in the Soviet Union . The institute for preparation for study abroad (IVA) of the so-called ABF II in Halle (Saale) prepared delegated students from all over the GDR for study abroad from 1954 to 1991 .

After obtaining his school-leaving certificate (Abitur), he began studying at the Faculty of Physics at Leningrad University from September 1969 to February 1975 , later renamed St. Petersburg State University . In line with his talent and inclination for mathematics, he attended lectures by leading mathematicians in Leningrad (today: Saint Petersburg ): Mikhail Shlemovich Birman, Ludwig Faddeev , Olga Ladyzhenskaya , Boris Sergeevich Pavlov. He graduated with honors from Professor Birman in 1975 in the field of mathematical physics.

Activity as a scientist

From 1975 to 1991 Neidhardt worked as a research assistant at WIAS, the Weierstrass Institute for Applied Analysis and Stochastics of the Academy of Sciences of the GDR in Berlin, in the group "Operator Theory and Mathematical Physics" led by Professor Hellmut Baumgärtel . In 1979 he received his doctorate there. rer. nat. on the subject of "Integration of evolution equations with the help of evolution semi-groups". He completed his habilitation there in 1987 as a Dr. sc. nat. (GDR) with the topic "A mathematical scattering theory for maximally dissipative operators". After 1989 Neidhardt worked as a research assistant at the Department of Mathematics MA 7-2 at the Technical University of Berlin (Jan. 1992 - Dec. 1993) and at the Department of Mathematics at the University of Potsdam (Jan. 1994 - Dec. 1999), and from Jan. 2000 until his professional retirement in 2016 at the Weierstrass Institute in Berlin.

Several stays abroad led him to a. September - December 1977 to the International Banach Center for Mathematics in Warsaw , April - June 1982 to the Mathematical Institute of the National Academy of Sciences of Ukraine in Kiev and from September 1986 to September 1990 to the Bogoliubov Laboratory for Theoretical Physics (BLTP) of the United Institute for Nuclear Research (VIK) in Dubna / Russia . There he worked in the research sector "Mathematical Problems of Physics" (Head: Dr. P. Exner).

From 1978 to 2019, Hagen Neidhardt published a total of over 190 publications. He has worked particularly productively with Jussi Behrndt , Johannes Brasche (* 1956, † 2018), Pavel Exner , Takashi Ichinose, Mark M. Malamud , Joachim Rehberg, Valentin Zagrebnov .

Several mathematical concepts were named after Neidhardt: the Koplienko-Neidhardt trace formula and the Howland-Evans-Neidhardt approach to evolution equations in the Hilbert space.

Neidhardt supervised several researchers scientifically during their doctorate: These include Arthur Stephan (dissertation in preparation, WIAS), Lukas Wilhelm, "A Rigorous Landauer-Büttiker Formula and its Application to Models of a Quantum Dot LED" (2013, jointly supervised with Alexander Mielke , WIAS / HUB) and Michael Baro, "One-dimensional Open Schrödinger-Poisson Systems" (2005, WIAS / HUB).

The international conference "Operator Theory and Krein Spaces" in Vienna (December 19-22, 2019) with 60 participants was dedicated to the memory of Hagen Neidhardt.

Individual evidence

  1. ↑ http://www.bitex-reichenbach.de/index.php/geschichte-der-tex , accessed on January 4, 2020
  2. ↑ https://www.industrie-kultur-ost.de/ruinen-datenbank/textilindustrie/veb-vogtlandstoffe-reichenbach/ , http://www.industriekultur.pfl.de/vogtlandstoffe.html , accessed on Jan. 4 2020
  3. ↑ http://www.pdmi.ras.ru/~birman/biography.html , accessed on Jan. 4, 2020
  4. ↑ http://www.mathnet.ru/eng/person17940 , accessed on Jan. 4, 2020
  5. ↑ https://www.researchgate.net/scientific-contributions/2044874388_Hellmut_Baumgärtel , accessed on Jan. 4, 2020
  6. ↑ https://www.genealogy.math.ndsu.nodak.edu/id.php?id=34827 , accessed on Jan. 4, 2020
  7. ↑ https://hugo-riemann.de/neidhardt/2005-CV-hagen-neidhardt.pdf , accessed on Jan. 14, 2020
  8. ↑ http://theor.jinr.ru/lab_en.html , accessed on Jan. 4, 2020
  9. ↑ https://scholar.google.de/citations?hl=de&user=e0N-QCYAAAAJ&view_op=list_works&sortby=pubdate , accessed on Jan. 4, 2020
  10. ↑ https://www.math.tugraz.at/~behrndt/ , accessed on Jan. 4, 2020
  11. ↑ https://www.mathematik.tu-clausthal.de/ueber-uns/nachrichtenarchiv/nachrichtendetails/archive/2018/december/?no_cache=1&tx_ttnews%5Bday%5D=18&tx_ttnews%5Btt_news%5D=122&cHash=f857ce63a607cc . Accessed on the Jan 15, 2020
  12. ↑ https://researchmap.jp/read0010037/?lang=english , accessed on Jan 15, 2020. Ichinose and Neidhardt worked on an as yet unpublished book project
  13. ↑ http://eng.rudn.ru/science/rudn-scientists/mark-malamud/ , accessed on Jan. 4, 2020
  14. ↑ https://www.wias-berlin.de/contact/staff/index.jsp?lang=0&uname=rehberg , accessed on January 4, 2020
  15. ↑ https://www.genealogy.math.ndsu.nodak.edu/id.php?id=55219&fChrono=1 , accessed on Jan. 4, 2020
  16. ↑ https://arxiv.org/pdf/1705.04782.pdf , accessed on Jan. 4, 2020
  17. ↑ Marcantognini, SAM, “Koplienko-Neidhardt trace formula for pairs of contraction operators and pairs of maximal dissipative operators”, Mathematische Nachrichten, 279: 7 (2006), 784, accessed on Jan. 4, 2020
  18. ↑ https://www.asc.tuwien.ac.at/~otind/OTKR2019/downloads/Abstracts/Zagrebnov.pdf , accessed on Jan. 4, 2020
  19. ↑ https://www.asc.tuwien.ac.at/~otind/OTKR2019/ , accessed on January 4, 2020
personal data
SURNAME Neidhardt, Hagen
ALTERNATIVE NAMES Neidhardt, Hagen Ernst (full name)
BRIEF DESCRIPTION German mathematician
DATE OF BIRTH November 20, 1950
PLACE OF BIRTH Gefell , Thuringia
DATE OF DEATH 23 March 2019
Place of death Berlin