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The concept of a sheaf was conceived in the German camp for prisoners of war called Oflag XVII where French officers taken captive during the fighting in France in the spring 1940 were imprisoned. Among them was the mathematician and lieutenant Jean Leray. In the camp he gave a course in algebraic topology (!!) during which he introduced some version of the theory of sheaves.
https://www.uio.no/studier/emner/matnat/math/MAT4215/v15/notes1.pdf
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> That's to say, if you weren't a mathematician when you started, you will be when you finish.
