Paul Stäckel

Paul Gustav Samuel Stäckel (1862 to 1919) was a German mathematician who worked in differential geometry, number theory and non-Euclidean geometry. In prime number theory he was the first to use the term twin prime, in its German form Primzahlzwilling. He studied mathematics and physics at the University of Berlin, wrote his doctoral dissertation in 1885 under Leopold Kronecker and Karl Weierstrass, and completed his habilitation at Halle in 1891. He then held chairs at Kiel, Hannover, Karlsruhe and Heidelberg. Stäckel was also a historian of mathematics who edited the correspondence of Gauss and Wolfgang Bolyai, took part in the editions of the collected works of Euler and Gauss, and translated classic texts into German. He spoke at the International Congress of Mathematicians in 1904 and presided over the German Mathematical Society in 1905.