When1: 1837
When2: 1850
Who: Bernard Bolzano [Bolzano, Bernard]
What: mathematician
Where: Bohemia
works\ Scientific Theory [1837]; Paradoxes of Infinity [1850]
Detail: He lived 1781 to 1848 and studied continuity and set theory. Real numbers in closed intervals can be in one-to-one correspondence with real numbers in other closed intervals. Infinite sequences in closed intervals have limits {Bolzano-Weierstrass theorem}. Truths can be a priori. Logic is about ideals, not about time or space.
Mathematical Sciences>Mathematics>History>Set Theory
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Date Modified: 2022.0224