Georg Hamel

{{Infobox scientist

| name = Georg Hamel

| image =Georg Hamel.jpg

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| caption = circa 1950. TU Berlin

| birth_date = 12 September 1877

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| death_date = {{Death-date and age|4 October 1954|12 September 1877}}

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| workplaces = Technische Universität Berlin

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| thesis_title = On the geometries in which the degrees are the shortest

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| thesis_year = 1901

| doctoral_advisor = David Hilbert

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| doctoral_students = Michael Sadowsky
Wilhelm Cauer
Richard von Mises

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| known_for = Jeffery–Hamel flow
Hamel basis

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}}Georg Karl Wilhelm Hamel (12 September 1877 – 4 October 1954) was a German mathematician with interests in mechanics, the foundations of mathematics and function theory.{{MacTutor Biography|id=Hamel}}

Biography

Hamel was born in Düren, Rhenish Prussia. He studied at Aachen, Berlin, Göttingen, and Karlsruhe. His doctoral adviser was David Hilbert.{{MathGenealogy|id=7349}} He taught at Brünn in 1905, Aachen in 1912, and at Technische Universität Berlin in 1919. In 1927, Hamel studied the size of the key space for the Kryha encryption device. He was an Invited Speaker of the International Congress of Mathematicians in 1932 at Zurich and in 1936 at Oslo.{{cite book|author=Hamel, Georg|chapter=Räumliche Strahlen mit konstanter Geschwindigkeit|title=In: Comptes Rendus du Congrès International des Mathématiciens, Oslo, 1936|volume=2|pages=261–262|chapter-url=http://www.mathunion.org/ICM/ICM1936.2/Main/icm1936.2.0261.0262.ocr.pdf|access-date=4 December 2017|archive-date=5 December 2017|archive-url=https://web.archive.org/web/20171205093052/http://www.mathunion.org/ICM/ICM1936.2/Main/icm1936.2.0261.0262.ocr.pdf|url-status=dead}} He was the author of several important treatises on mechanics. He became a member of the Prussian Academy of Sciences in 1938{{cite web|url=https://www.math.berlin/mathematiker/georg-karl-wilhelm-hamel.html|title=Georg Karl Wilhelm Hamel (1877-1954)|work=Mathematician of the month|date=November 2015|language=de|publisher=Berliner Mathematische Gesellschaft e.V.|access-date=2024-06-03}} and the Bavarian Academy of Sciences in 1953.{{cite web|url=https://badw.de/en/community-of-scholars/deceased.html?tx_badwdb_badwperson%5Baction%5D=show&tx_badwdb_badwperson%5Bcontroller%5D=BADWPerson&tx_badwdb_badwperson%5BpartialType%5D=BADWPersonDetailsPartial&tx_badwdb_badwperson%5Bper_id%5D=1146&cHash=01042f251bd016fdc5256bc6f62771df|publisher=Bavarian Academy of Sciences|title=Deceased members: Dr. Georg Hamel|access-date=2024-06-03}} He died in Landshut, Bavaria.

Selected publications

{{citation|title=Über die Geometrieen, in denen die Geraden die Kürzesten sind |year=1901|publisher=Dieterich'schen Universitäts-Buch-Druckerei|location=Göttigen|url=https://catalog.hathitrust.org/Record/008931922}} ("On the geometries in which the straight lines are the shortest", Hamel's doctoral dissertation on Hilbert's fourth problem. A version may be found in Mathematische Annalen 57, 1903.)
{{citation|title=Lagrange-Euler'schen gleichungen der Mechanik|location=Leipzig|publisher=B.G. Teubner|year=1903|url=https://catalog.hathitrust.org/Record/102143774}}
{{citation|year=1905|title=Eine Basis aller Zahlen und die unstetigen Lösungen der Funktionalgleichung f(x+y)=f(x)+f(y)|journal=Mathematische Annalen|location=Leipzig|volume=60|pages=459–462| doi=10.1007/BF01457624 | s2cid=120063569 |url=http://www.digizeitschriften.de/dms/img/?PID=GDZPPN002260395| last1=Hamel | first1=Georg | issue=3 }}
{{citation|title=Elementare mechanik|location=Leipzig und Berlin|publisher=B. G. Teubner|year=1912|url=https://catalog.hathitrust.org/Record/012308189}}
{{citation|title=Grundbegriffe der Mechanik|series=Aus Natur und Geisteswelt,684. BDCHN.|year=1921|location=Leipzig|url=https://catalog.hathitrust.org/Record/007086369}}
{{citation|title=Integralgleichungen|year=1937|location=Berlin|publisher=Springer}}{{citation|author=Longley, W. R.|journal=Bull. Amer. Math. Soc.|title=Review of Integralgleichungen by G. Hamel|volume=44|issue=5|year=1938|pages=315–316|url=https://www.ams.org/journals/bull/1938-44-05/S0002-9904-1938-06726-2/S0002-9904-1938-06726-2.pdf|doi=10.1090/s0002-9904-1938-06726-2|doi-access=free}}
{{citation|title=Komplexe Form der ebenen Bewegungsgleichungen zäher, inkompressibler Flüssigkeiten|location=Berlin|publisher=Verlag der Akademie der Wissenschaften, in Kommission bei W. de Gruyter|year=1941}}
{{citation|title=Aufbau einer Theorie der Häute und der dünnen Schalen nach der Methode von Lagrange|location=Berlin|publisher=Akademie der Wissenschaften, in Kommission bei W. de Gruyter|year=1944}}
{{citation|title=Theoretische Mechanik|location=Berlin|publisher=Springer|year=1949}}{{citation|author=Prager, W.|authorlink=William Prager|title=Review of Theoretische Mechanik by G. Hamel|journal=Bull. Amer. Math. Soc.|volume=57|issue=2|year=1951|pages=159–160|url=https://www.ams.org/journals/bull/1951-57-02/S0002-9904-1951-09492-6/S0002-9904-1951-09492-6.pdf|doi=10.1090/s0002-9904-1951-09492-6}}