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Alexander Dinghas (February 9, 1908 – April 19, 1974) was a
Alexander Dinghas
{{DEFAULTSORT:Dinghas, Alexander 1908 births 1974 deaths 20th-century Greek mathematicians Academic staff of the Free University of Berlin Humboldt University of Berlin alumni Academic staff of the Humboldt University of Berlin National Technical University of Athens alumni Smyrniote Greeks
Alexander Dinghas (February 9, 1908 – April 19, 1974) was a Greek
Greek may refer to:
Anything of, from, or related to Greece, a country in Southern Europe:
*Greeks, an ethnic group
*Greek language, a branch of the Indo-European language family
**Proto-Greek language, the assumed last common ancestor of all kno ...
mathematician.
Biography
Dinghas was born on February 9, 1908, inSmyrna
Smyrna ( ; , or ) was an Ancient Greece, Ancient Greek city located at a strategic point on the Aegean Sea, Aegean coast of Anatolia, Turkey. Due to its advantageous port conditions, its ease of defence, and its good inland connections, Smyrna ...
(now Ä°zmir
Ä°zmir is the List of largest cities and towns in Turkey, third most populous city in Turkey, after Istanbul and Ankara. It is on the Aegean Sea, Aegean coast of Anatolia, and is the capital of Ä°zmir Province. In 2024, the city of Ä°zmir had ...
), Turkey
Turkey, officially the Republic of Türkiye, is a country mainly located in Anatolia in West Asia, with a relatively small part called East Thrace in Southeast Europe. It borders the Black Sea to the north; Georgia (country), Georgia, Armen ...
. He did his schooling in Smyrna. He and his family moved to Athens
Athens ( ) is the Capital city, capital and List of cities and towns in Greece, largest city of Greece. A significant coastal urban area in the Mediterranean, Athens is also the capital of the Attica (region), Attica region and is the southe ...
in 1922.
Dinghas completed his secondary school and entered the National Technical University of Athens
The National (Metsovian) Technical University of Athens (NTUA; , ''National Metsovian Polytechnic''), sometimes known as Athens Polytechnic, a university in Athens, Greece. It is named in honor of its benefactors Nikolaos Stournaris, Eleni Tosi ...
in 1925. He graduated with a diploma in electrical and mechanical engineering in 1930.
In 1931 Dinghas began his studies at the University of Berlin
The Humboldt University of Berlin (, abbreviated HU Berlin) is a public research university in the central borough of Mitte in Berlin, Germany.
The university was established by Frederick William III on the initiative of Wilhelm von Humbol ...
in Berlin
Berlin ( ; ) is the Capital of Germany, capital and largest city of Germany, by both area and List of cities in Germany by population, population. With 3.7 million inhabitants, it has the List of cities in the European Union by population withi ...
, Germany
Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...
. He completed his doctorate in mathematics in 1936. He studied under Erhard Schmidt
Erhard Schmidt (13 January 1876 – 6 December 1959) was a Baltic German mathematician whose work significantly influenced the direction of mathematics in the twentieth century. Schmidt was born in Tartu (), in the Governorate of Livonia (now ...
.
Dinghas was not a German and his career during the Nazi years was very difficult. However, after the end of World War II, his luck changed. He became professor of mathematics at the Humboldt University of Berlin
The Humboldt University of Berlin (, abbreviated HU Berlin) is a public research university in the central borough of Mitte in Berlin, Germany.
The university was established by Frederick William III on the initiative of Wilhelm von Humbol ...
in 1947. From 1949 until his death he was a professor of mathematics at the Free University of Berlin
The Free University of Berlin (, often abbreviated as FU Berlin or simply FU) is a public university, public research university in Berlin, Germany. It was founded in West Berlin in 1948 with American support during the early Cold War period a ...
and director of the Mathematical Institute there.
Dinghas died on April 19, 1974, in Berlin, Germany.
Work
Dinghas is known for his work in different areas of mathematics including differential equations, functions of a complex variable, functions of several complex variables, measure theory and differential geometry. His most important contribution was his work in function theory, in particularNevanlinna theory In the mathematical field of complex analysis, Nevanlinna theory is part of the
theory of meromorphic functions. It was devised in 1925, by Rolf Nevanlinna. Hermann Weyl called it "one of the few great mathematical events of (the twentieth) centu ...
and the growth of subharmonic function
In mathematics, subharmonic and superharmonic functions are important classes of functions used extensively in partial differential equations, complex analysis and potential theory.
Intuitively, subharmonic functions are related to convex functi ...
s.
Selected works
* Vorlesungen über Funktionentheorie, Springer 1961 * Minkowskische Summen und Integrale. Superadditive Mengenfunktionale. Isoperimetrische Ungleichungen (1961) * Einführung in die Cauchy-Weierstrass'sche Funktionentheorie, BI, 1968 * Zur Differentialgeometrie der klassischen Fundamentalbereiche, Springer 1974References
* *External links
Alexander Dinghas
{{DEFAULTSORT:Dinghas, Alexander 1908 births 1974 deaths 20th-century Greek mathematicians Academic staff of the Free University of Berlin Humboldt University of Berlin alumni Academic staff of the Humboldt University of Berlin National Technical University of Athens alumni Smyrniote Greeks