Günter Lumer

{{short description|German-born mathematician (1929–2005)}}

{{ Infobox scientist

| name = Günter Lumer

| image = Gunter Lumer.jpg

| caption = Günter Lumer in Prague, 1987

| birth_date = May 29, 1929

| birth_place = Frankfurt, Germany

| death_date = {{death date and age|2005|1929}}

| fields = Mathematics

| workplaces = University of Washington
University of Mons-Hainaut

| alma_mater = University of Chicago
Universidad de la Republica

| doctoral_advisor = Irving Kaplansky

}}

Günter Lumer (May 29, 1929 – 2005) was a German-born mathematician known for his work in functional analysis. He is the namesake of the Lumer–Phillips theorem on semigroups of operators on Banach spaces, and was the first to study L-semi-inner products. Born in Germany and raised in France and Uruguay, he spent his professional career in the United States and Belgium.{{cite web|url=https://math.umons.ac.be/en/membres/Gunter_Lumer.html|title=Günter Lumer (1929–2005)|first=Serge|last=Nicaise|publisher=Mathematics Department, University of Mons|accessdate=2015-08-30}}.
- {{cite book | last1 = Amann | first1 = H. | last2 = Arendt | first2 = W. | last3 = Neubrander | first3 = F. | last4 = Nicaise | first4 = S. | last5 = von Below | first5 = J. | editor1-first = Herbert | editor1-last = Amann | editor2-first = Wolfgang | editor2-last = Arendt | editor3-first = Matthias | editor3-last = Hieber | editor4-first = Frank M | editor4-last = Neubrander | editor5-first = Serge | editor5-last = Nicaise | editor6-first = Joachim | editor6-last = von Below | contribution = Life and work of Günter Lumer | doi = 10.1007/978-3-7643-7794-6 | location = Basel | mr = 2402716

| pages = ix–xvii | publisher = Birkhäuser | title = Functional Analysis and Evolution Equations: The Günter Lumer Volume | year = 2008| isbn = 978-3-7643-7793-9 }}.

Lumer was born in Frankfurt, on May 29, 1929. His family fled the Nazis in 1933, moving to France and then again in 1941 to Uruguay, where he became a citizen. Lumer studied at the Universidad de la República, where he came under the influence of Paul Halmos; his first mathematics paper, published in 1953, was jointly authored by Halmos and Juan Jorge Schäffer. He completed a degree in electrical engineering at Montevideo in 1957, and traveled to Halmos' home institution, the University of Chicago, on a Guggenheim Fellowship. At Chicago, he completed a doctorate in 1959 under the supervision of Irving Kaplansky.{{Cite web|title=Gunter Lumer |url=https://mathgenealogy.org/id.php?id=5724|access-date=December 21, 2021|website=The Mathematics Genealogy Project}}

Following short-term positions at the University of California, Los Angeles and Stanford University, he joined the faculty at the University of Washington in 1961. He moved to the University of Mons-Hainaut in 1973, and then to the International Solvay Institutes for Physics and Chemistry in Brussels in 1999, where he remained until his death in 2005.