. "1902-04-17Z"^^ . "German mathematician" . . "1983Z"^^ . . . . . . . . . . . . . . "Hopf, Eberhard"@en . . . "Eberhard Hopf"@en . . "1902Z"^^ . . "Eberhard Frederich Ferdinand Hopf (April 17, 1902, Salzburg, Austria-Hungary \u2013 July 24, 1983, Bloomington, Indiana) was a mathematician and astronomer, one of the founding fathers of ergodic theory and a pioneer of bifurcation theory who also made significant contributions to the subjects of partial differential equations and integral equations, fluid dynamics, and differential geometry."@en . "1983-07-24Z"^^ .