Otto H. Kegel

Otto Helmut Kegel
Kegel in 2010
Born(1934-07-20)20 July 1934
Bethlehem, Pennsylvania, U.S.
Died20 July 2025(2025-07-20) (aged 91)
EducationGoethe University Frankfurt (PhD)
Scientific career
FieldsMathematics
InstitutionsUniversity of Freiburg
Doctoral studentsFelix Leinen

Otto Helmut Kegel (German: [ˈɔtoː ˈhɛlmuːt ˈkeːgəl]; 20 July 1934 – 20 July 2025) was a German mathematician who worked on group theory. He was a professor at the University of Freiburg.

Early life and career

Kegel was born on 20 July 1934 in Bethlehem, Pennsylvania.[1][2] He received his PhD from Goethe University Frankfurt in 1961, with a thesis titled Vertauschbarkeit von Untergruppen und Kompositionsstruktur in endlichen Gruppen (Commutability of subgroups and composition structure in finite groups) and supervised by Reinhold Baer.[3] He completed his habilitation at the same institution in 1966.[4]

In 1962, Kegel gave a talk titled Locally finite groups with a partition at the International Congress of Mathematicians, in Stockholm, Sweden.[5]

Kegel was a professor at the University of Freiburg beginning in 1975.[4][6] He was an editor for Archiv der Mathematik from 1975 until 1990.[4][7]

Death

Kegel died on 20 July 2025, his 91st birthday.[8]

Awards and honors

In 1985, Archiv der Mathematik dedicated an issue to Kegel, in honor of his contributions to the journal as an author, editor, and on the advisory board.[7] A conference Algebra and Group Theory was held in Kegel's honor at the University of Upper Alsace in 2015.[9] The 2024 edition of the Ischia Group Theory conference was also dedicated to Kegel, marking his 90th birthday.[10]

Selected publications

  • Kegel, Otto H. (1962). "Sylow-Gruppen und Subnormalteiler endlicher Gruppen". Mathematische Zeitschrift. 78: 205–221. doi:10.1007/BF01195169. MR 0147527. Zbl 0082.24703.
  • Kegel, Otto H.; Wehrfritz, Bertram A. F. (1973). Locally finite groups. North-Holland Publishing Co. MR 0470081. Zbl 0259.20001.

References

  1. ^ "Kegel, Otto H." Deutsche Biographie. Retrieved 2 August 2025.
  2. ^ "Zur Person". Badische Zeitung. 20 July 2004. Retrieved 3 August 2025.
  3. ^ Otto H. Kegel at the Mathematics Genealogy Project
  4. ^ a b c Kürschners Deutscher Gelehrten-Kalender. K. G. Saur Verlag. 2009. ISBN 978-3-598-23629-7.
  5. ^ "International Congress of Mathematicians | Programme" (PDF). International Mathematical Union. 1962. Retrieved 26 July 2025.
  6. ^ "Prof. Dr. rer. nat. Otto H. Kegel". Badische Zeitung. 31 July 2025. Retrieved 3 August 2025 – via BZTrauer.
  7. ^ a b "Dedication to Prof. Dr. Otto H. Kegel". Archiv der Mathematik. 85 (1): 1–2. 1985. doi:10.1007/s00013-005-0009-y.
  8. ^ "Otto H. Kegel | 20 July 1934 - 20 July 2025". Badische Zeitung. 26 July 2025. Retrieved 2 August 2025 – via BZTrauer.
  9. ^ "Conference: Algebra and Group Theory". University of Upper Alsace. Retrieved 27 July 2025.
  10. ^ "Ischia Group Theory 2024 (conference homepage)". Retrieved 26 July 2025.
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