Hermann Hankel (1874) Zur Geschichte der Mathematik in Alterthum und Mittelalter, Teubner, Leipzig. Hermann Hankel (1875) Die Elemente der projectivischen Geometrie in synthetischer Behandlung, Teubner, Leipzig. Notes References . . "Riemann's conditions for integrability and their influence on the birth of the concept of measure" (English translation of title) is an article on the history of measure theory, analyzing deeply and comprehensively every early contribution to the field, starting from Riemann's work and going to the works of Hermann Hankel, Gaston Darboux, Giulio Ascoli, Henry John Stephen Smith, Ulisse Dini, Vito Volterra, Paul David Gustav du Bois-Reymond and Carl Gustav Axel Harnack. External links 1839 births 1873 deaths 19th-century German mathematicians German historians of mathematics Mathematical analysts Complex analysts People from Halle (Saale) People from the Province of Saxony University of Göttingen alumni Humboldt University of Berlin alumni Leipzig University alumni Academic staff of Leipzig University Academic staff of the University of Erlangen-Nuremberg Academic staff of the University of Tübingen