Stefan Banach ; 30 March 1892 – 31 August 1945) was a Polish mathematician who is generally considered one of the 20th-century's most important and influential mathematicians. He was the founder of modern functional analysis, and an original member of the Lwów School of Mathematics. His major work was the 1932 book, Théorie des opérations linéaires, the first monograph on the general theory of functional analysis.

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