Willi Jäger (born 15 August 1940 in Kschellowitz, Bohemia) is a German mathematician. He completed his PhD in 1966 the

University of Munich The Ludwig Maximilian University of Munich (simply University of Munich or LMU; german: Ludwig-Maximilians-Universität München) is a public research university in Munich, Germany. It is Germany's sixth-oldest university in continuous operatio ...

under the direction of Erhard Heinz. From 1969 to 1970 Jäger was a visiting scientist at the

Courant Institute The Courant Institute of Mathematical Sciences (commonly known as Courant or CIMS) is the mathematics research school of New York University (NYU), and is among the most prestigious mathematics schools and mathematical sciences research cente ...

New York City New York, often called New York City or NYC, is the most populous city in the United States. With a 2020 population of 8,804,190 distributed over , New York City is also the most densely populated major city in the Un ...

. In 1970 he became professor of mathematics at the

University of Münster The University of Münster (german: Westfälische Wilhelms-Universität Münster, WWU) is a public research university located in the city of Münster, North Rhine-Westphalia in Germany. With more than 43,000 students and over 120 fields of stud ...

and from 1974 he became professor of applied mathematics at the

Heidelberg University } Heidelberg University, officially the Ruprecht Karl University of Heidelberg, (german: Ruprecht-Karls-Universität Heidelberg; la, Universitas Ruperto Carola Heidelbergensis) is a public university, public research university in Heidelberg, B ...

. In 1987 Jäger was founding member of the

Interdisciplinary Center for Scientific Computing 200px, South west view of the IWR building, located at Heidelberg's New Campus (until March 2016) The Interdisciplinary Center for Scientific Computing (short IWR) is a scientific research institute of the Heidelberg University, Germany. It centr ...

Heidelberg Heidelberg (; Palatine German language, Palatine German: ''Heidlberg'') is a city in the States of Germany, German state of Baden-Württemberg, situated on the river Neckar in south-west Germany. As of the 2016 census, its population was 159,914 ...

. He is a board member of the Mathematical Research Institute of Oberwolfach. In addition to problems of scientific computing, including the effective use of computers for the mathematical modeling of complicated, mostly scientific problems, Jäger deals with problems of nonlinear differential equations, calculus of variations,

branching process In probability theory, a branching process is a type of mathematical object known as a stochastic process, which consists of collections of random variables. The random variables of a stochastic process are indexed by the natural numbers. The origi ...

es, and the

spectral theory In mathematics, spectral theory is an inclusive term for theories extending the eigenvector and eigenvalue theory of a single square matrix to a much broader theory of the structure of operators in a variety of mathematical spaces. It is a result ...

of differential operators, mostly with a view to specific applications such as data visualization. Thus far, he has been honoured with 2 honorary doctorates, several prizes and the

Order of Merit of the Federal Republic of Germany The Order of Merit of the Federal Republic of Germany (german: Verdienstorden der Bundesrepublik Deutschland, or , BVO) is the only federal decoration of Germany. It is awarded for special achievements in political, economic, cultural, intellect ...

. He gave a DMV Gauss Lecture in 2007. Jäger had more than 100 PhD students, including Florin Diacu, Bernold Fiedler, Stephan Luckhaus, and Martin Vingron.

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* {{DEFAULTSORT:Jager, Willi Officers Crosses of the Order of Merit of the Federal Republic of Germany 20th-century German mathematicians 21st-century German mathematicians 1940 births Living people People from Plzeň-North District Ludwig Maximilian University of Munich alumni Academic staff of the University of Münster Academic staff of Heidelberg University Fulbright alumni