EntityQ78445· pop 16· linked from 13 articlesGerhard HessenbergSign in to saveGerman mathematician (1874–1925)ConnectionsmathematicsEntityBerlinEntityFrankfurtEntityset theoryEntitymathematicianEntitydigital object identifierEntityHumboldt-Universität zu BerlinEntityDoctor of PhilosophyEntitydifferential geometryEntityprojective geometryEntitythesisEntityordinal numberEntityMathematics Genealogy ProjectEntityUniversity of WrocławEntityQ22908627EntityInternational Congress of MathematiciansEntityHermann SchwarzEntityDesargues' theoremEntityLazarus FuchsEntityPappus's hexagon theoremEntityCategories1874 births1925 deaths19th-century German mathematicians20th-century German mathematiciansGerman geometers