Ringel–Hall algebra, generalization of the Hall algebra, studied by Ringel (1990)
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Gian-Piero Ringel studied film production at the Deutsche Film- und Fernsehakademie Berlin (dffb).
Specializing q to 1, these symmetric functions become Schur functions, which are thus closely connected with the theory of Hall polynomials.
Faye Ringel, former American professor of Humanities at the United States Coast Guard Academy and an author
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Julius Ringel (1889–1967), Austrian-born German General of Mountain Troops (General der Gebirgstruppen)
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Erwin Ringel (1921–1994), Austrian psychiatrist and neurologist who dedicated his life to suicide prevention