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Wiener letter to Franklin. After Norbert Wiener suggested to his friend Phillip Franklin in a letter that they hang a sign outside their office at MIT reading "Wiener and Franklin. Wholesale and Retail Mathematicians and Exporters," he wrote: "As to the state of the market: differential geometry seems rather quiet, and some of the principal operators have deserted it for other securities. Real and complex variables continue firm, without much change. Analysis situs has a bull market. Bull operators have been very active in differential equations, also. Quantum theory continues speculative, with chances of a very sharp rise, but the market contains a lot of wildcat stock. Hilbert, Brouwer, and Co. are doing well with mathematical logic."

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Norbert Wiener
Phillip Franklin
Wednesday, July 22, 1925