Edgar Krahn

{{Short description|Estonian mathematician (1894–1961)}}

{{Infobox academic

|name = Edgar Krahn

|image = Edgar Krahn.jpg

|image_size =

|caption =

|birth_date = {{birth-date|1 October 1894}}

|birth_place = Laiuse, Estonia

|death_date = {{d-da|6 March 1961|1 October 1894}}

|death_place = Rockville, Maryland, United States

|discipline = Mathematics

|work_institutions =

|alma_mater = {{ubl|University of Tartu (1918)|University of Göttingen (1926)}}

|doctoral_advisor =

|doctoral_students =

|known_for = Rayleigh–Faber–Krahn inequality

}}

Edgar Krahn ({{osd|1 October|1894|19 September}} – 6 March 1961) was an Estonian mathematician.Ülo Lumiste, Jaak Peetre (eds.), Edgar Krahn 1894 – 1961, IOS Press, 1994, {{ISBN|90-5199-168-1}} Krahn was born in Sootaga (now Laiuse, Jõgeva County), Governorate of Livonia, as a member of the Baltic German minority. He died in Rockville, Maryland, United States.

Krahn studied at the University of Tartu and the University of Göttingen. He graduated at Tartu in 1918, received his doctoral degree at Göttingen in 1926, with Richard Courant as his advisor,{{MathGenealogy |id=59050}} and his habilitation took place at Tartu in 1928. He is co-author of the Rayleigh–Faber–Krahn inequality.{{SpringerEOM|title=Rayleigh–Faber–Krahn inequality}}

Krahn worked in Estonia, Germany, the United Kingdom, and the United States in the following areas of pure and applied mathematics:

• Differential geometry
• Differential equations
• Bausparmathematik, which is distantly related to insurance mathematics
• Probability theory
• Gas dynamics
• Elasticity theory