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When Gauss died in 1855, his post at Göttingen was taken by Peter Gustav Lejeune Dirichlet. One mathematician who found the presence of Dirichlet a stimulus to research was Bernhard Riemann, and his few short contributions to mathematics were among the most influential of the century. Riemann’s first paper, his doctoral thesis (1851) on the theory of complex functions, provided the foundations for a geometric treatment of functions of a complex variable. His main result guaranteed the existence of a wide class of complex functions satisfying only modest general requirements and so made it clear that complex functions could be ...(100 of 41449 words)