Bernard Bolzano



         


Bernard Placidus Johann Nepomuk Bolzano (October 5, 1781December 18, 1848) was a Czech mathematician, theologian, and philosopher. He was born in Prague.

He is known for Bolzano's theorem, and also jointly with Karl Weierstrass developed the Bolzano-Weierstrass theorem.

In his philosophy, Bolzano attacked the idealism of Hegel and Kant by asserting that numbers, ideas, and truths exist apart from the people who think of them.


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