Stefan Banach was a Polish mathematician, the creator of modern functional analysis and the theory of topological vector spaces. He made significant contributions to measure theory, integration theory, set theory, and orthogonal series. In his doctoral dissertation written in 1920, he axiomatically defined what is today called the Banach space.
There is a story that before World War II he was offered a check with a "1" and could on it add as many "0s" as he wanted replied. ‘Oh, any price would be too small to leave Poland,' he replied.
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