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Dahlquist began to study mathematics at [[Stockholm University]] in 1942 at the age of 17, where he cites the Danish mathematician [[Harald Bohr]] (who was living in exile after the [[occupation of Denmark]] during [[World War II]]) as a profound influence.<ref name="siam-obit">{{Cite web |url=http://www.siam.org/news/news.php?id=54 |title=SIAM Obituary - Germund Dahlquist |access-date=2006-12-29 |archive-url=https://web.archive.org/web/20151121021850/http://www.siam.org/news/news.php?id=54 |archive-date=2015-11-21 |url-status=dead }}</ref> He received the degree of [[Licentiate (degree)|licentiat]] from Stockholm University in 1949, before taking a break from his studies to work at the Swedish Board of Computer Machinery ([[Matematikmaskinnämnden]]), working on (among other things) the early computer [[BESK]], Sweden's first. During this time, he also worked with [[Carl-Gustaf Rossby]] on early numerical weather forecasts. Dahlquist returned to Stockholm University to complete his Ph.D., ''Stability and Error Bounds in the Numerical Solution of Ordinary Differential Equations'', which he defended in 1958, with [[Fritz Carlson]] and [[Lars Hörmander]] as his advisors.<ref>{{MathGenealogy|id= 20637}}</ref> As part of this work he introduced the [[logarithmic norm]] (also introduced by Russian mathematician [[Sergei Lozinskii]] the same year). In 1959 he moved to the [[Royal Institute of Technology]] (KTH), where he would later establish what became the Department of Numerical Analysis and Computer Science (NADA) in 1962 (now part of the School of Computer Science and Communication), and become Sweden's first Professor of Numerical Analysis in 1963.<ref>[http://www.nada.kth.se/om/historik/index.html.en NADA History]</ref> He helped establish the Nordic journal of numerical analysis, BIT, in 1961. In 1965 he was elected into the [[Royal Swedish Academy of Engineering Sciences]] (IVA). The software package [[COMSOL Multiphysics]], for [[finite element analysis]] of [[partial differential equations]], was started by a couple of Dahlquist's graduate students based upon codes developed for a graduate course at KTH.<ref name="siam-obit" /> ==See also== * [[Linear multistep method#First and second Dahlquist barriers|First and second Dahlquist barriers]] ==Honors and awards== *[[Society for Industrial and Applied Mathematics|SIAM]] 1988 John von Neumann lecturer. * SIAM 1991 [[Peter Henrici Prize]]. *[[Society for Industrial and Applied Mathematics#Prizes|SIAM Germund Dahlquist Prize]], established 1995, "Awarded to a young scientist (normally under 45) for original contributions to fields associated with Germund Dahlquist, especially the numerical solution of differential equations and numerical methods for scientific computing". *Three honorary doctorates, from [[Hamburg]] (1981), [[Helsinki]] (1994), and [[Linköping Institute of Technology|Linköping]] (1996). ==Notes== {{Reflist}} {{John von Neumann Lecturers}} {{Authority control}} {{DEFAULTSORT:Dahlquist, Germund}} [[Category:Numerical analysts]] [[Category:20th-century Swedish mathematicians]] [[Category:Academic staff of the KTH Royal Institute of Technology]] [[Category:1925 births]] [[Category:2005 deaths]] [[Category:Stockholm University alumni]] </textarea><div class="templatesUsed"><div class="mw-templatesUsedExplanation"><p><span id="templatesused">Pages transcluded onto the current version of this page<span class="posteditwindowhelplinks"> (<a href="/wiki/Help:Transclusion" title="Help:Transclusion">help</a>)</span>:</span> </p></div><ul> <li><a href="/wiki/Template:Authority_control" title="Template:Authority control">Template:Authority control</a> (<a href="/w/index.php?title=Template:Authority_control&action=edit" title="Template:Authority control">view source</a>) (template editor protected)</li><li><a href="/wiki/Template:Birth_date" title="Template:Birth date">Template:Birth date</a> 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