(Sitzungsberichte was continued as: Věstník Královské české společnosti nauk, třída matematicko-přírodovědecká (Journal of the Royal Czech Society of Science, Mathematics and Natural Sciences Class).) Around 1860, Charles Cellérier (1818 - 1889), a professor of mathematics, mechanics, astronomy, and physical geography at the University of Geneva, Switzerland, independently formulated a continuous, nowhere differentiable function that closely resembles Weierstrass's function. Cellérier's discovery was, however, published posthumously: Cellérier, C. (1890) "Note sur les principes fondamentaux de l'analyse" (Note on the fundamental principles of analysis), Bulletin des sciences mathématiques, second series, vol.