Bernard Bolzano (1781-1848)
Bernard Bolzano, born in Prague in 1781, was a Bohemian mathematician with Italian origins. Bolzano made several profound advances in mathematics that were not well publicized. As a result, his mathematical work was overlooked, often for many decades after his death. For example, his construction of a function that is continuous on an interval but nowhere differentiable, did not become known. Thus, the credit still goes to Karl Weierstrass, who found such a function about 30 years later. Boyer and Merzbach described Bolzano as “a voice crying in the wilderness,” since so many of his results had to be rediscovered by other workers.
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A fascinating parallel between a brilliant mathematician and an arch-villain of crime fiction is drawn in a forthcoming book – 
, which obviously does not converge, but alternates between 
and 
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