Johann Wilhelm Andreas Pfaff
Johann Wilhelm Andreas Pfaff (5 December 1774 – 26 June 1835), was professor of pure and applied mathematics successively at Dorpat, Nuremberg, Würzburg and Erlangen. He was a brother of Johann Friedrich Pfaff, a mathematician; and of Christian Heinrich Pfaff, a physician and physicist.
This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Pfaff, Johann Friedrich". Encyclopædia Britannica (11th ed.). Cambridge University Press.