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Erling Følner : ウィキペディア英語版 | Erling Følner
Erling Følner (18 November 1919 – 10 October 1991) was a Danish mathematician known for the Følner sequence. Professor at the Technical University of Denmark (Danmarks Tekniske Højskole, DtH) in the period from 1954 to 1974. Følner published a comprehensive survey of almost periodic functions with Harald Bohr, and continued with further studies on this topic in his doctoral dissertation.〔Den Store Danske. Gyldendals åbne Encyklopædi〕〔Følner, Erling: On the Structure of Generalized Almost Periodic Functions, 1945〕〔Bohr, Harald: Collected mathematical Works, I–III (ed. by Erling Følner & Børge Jessen), 1952〕 Følner is known internationally for the Følner sequence: a Følner sequence for a group is a sequence of sets satisfying a particular condition. If a group has a Følner sequence with respect to its action on itself, the group is amenable. A more general notion of Følner nets can be defined analogously, and is suited for the study of uncountable groups. Følner married Harald Bohr's daughter, Ellen Bohr (1923–1972). ==References==
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