EntityQ113731· pop 9· linked from 35 articlesGerhard RingelSign in to saveGerman-American mathematician (1919–2008)ConnectionsFreie Universität BerlinEntityRingel–Youngs theoremEntitySoviet UnionConceptInternational Standard Book NumberEntityCzechoslovakiaEntitymathematicianEntityWayback MachineEntityentomologyEntitydigital object identifierEntityWehrmachtEntityCharles UniversityEntitygraph theoryEntityOCLC, Inc.EntityQ180686EntitySanta CruzEntityDoctor of PhilosophyEntitybibcodeEntityUniversity of BonnEntityfour color theoremEntityQ229883EntityCategories1919 births2008 deaths20th-century American mathematicians20th-century German mathematicians21st-century American mathematicians21st-century German mathematiciansAcademic staff of the Free University of BerlinCharles University alumniGerman emigrants to CzechoslovakiaGerman emigrants to the United StatesGerman military personnel of World War II