Ernst Leonard Lindelöf

Ernst Lindelöf

Born	7 March 1870 Helsinki
Died	4 June 1946 (1946-06-05) (aged 76) Helsinki
Nationality	Finnish
Fields	Mathematics
Alma mater	University of Helsinki (Ph.D., 1893)
Thesis	Sur les systèmes complets et le calcul des invariants différentiels des groupes continus finis (1893)
Doctoral advisor	Hjalmar Mellin
Known for	Lindelöf hypothesis Lindelöf's lemma Lindelöf's theorem Lindelöf space Phragmén–Lindelöf principle Picard–Lindelöf theorem

Ernst Leonard Lindelöf (7 March 1870 – 4 June 1946) was a Finnish mathematician, who made contributions in real analysis, complex analysis and topology. Lindelöf spaces are named after him. He was the son of Lorenz Leonard Lindelöf and brother of the philologist Uno Lorenz Lindelöf.

Biography

Lindelöf studied at the University of Helsinki, where he completed his Ph.D. in 1893, became a docent in 1895 and professor of Mathematics in 1903. He was a member of the Finnish Society of Sciences and Letters.

In addition to working in a number of different mathematical domains including complex analysis, conformal mapping, topology, ordinary differential equations and the gamma function, Lindelöf promoted the study of the history of Finnish mathematics. He is known for the Picard–Lindelöf theorem on differential equations and the Phragmén–Lindelöf principle, one of several refinements of the maximum modulus principle that he proved in complex function theory.

Le calcul des résidus et ses applications à la théorie des fonctions (Paris, 1905)
Mémoire sur la théorie des fonctions entières d'ordre fini ("Acta societatis scientiarum fennicae" 31, 1903)
With Lars Edvard Phragmén: "Sur une extension d'un principe classique de l'analyse et sur quelques propriétés des fonctions monogènes dans le voisinage d'un point singulier", in: Acta mathematica 31, 1908.

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