Hermann Hankel

Hermann Hankel (1839 to 1873) was a German mathematician born in Halle who worked on complex numbers, the theory of functions and the history of mathematics. He studied at Leipzig, Göttingen under Bernhard Riemann and Berlin under Karl Weierstrass and Leopold Kronecker, and received his doctorate at Leipzig in 1862. He became an associate professor at Leipzig in 1867, a full professor at Erlangen the same year and spent his last four years at Tübingen. His 1867 treatise on complex number systems and his work on Bessel functions of the third kind, now called Hankel functions, are remembered, as are the Hankel transform and the Hankel matrix. He died at thirty four.