August 31
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1897: Thomas Edison patents the Kinetoscope, the first movie projector.
1899: Georg Cantor writes to Dedekind, remarking that his "diagonal process" could be used to show that the power set of a set has more elements than the set itself.
1945: Mathematician and academic Stefan Banach dies. Banach was one of the founders of modern functional analysis.
1950: Mathematician and philosopher Kurt Gödel addresses the International Congress of Mathematicians, in Cambridge, Massachusetts, on his work in relativity theory.