. . . "Hankel, Hermann"@en . "1873Z"^^ . . "German mathematician" . "Hermann Hankel"@en . "Hermann Hankel (14 February 1839 \u2013 29 August 1873) was a German mathematician who was born in Halle, Germany and died in Schramberg (near T\u00FCbingen), Imperial Germany.He studied and worked with, among others, M\u00F6bius, Riemann, Weierstrass and Kronecker.His 1867 exposition on complex numbers and quaternions is particularly memorable."@en . "1839Z"^^ . . . "1839-02-14Z"^^ . . "1873-08-29Z"^^ . .