Unbounded Operator Algebras and Representation Theory

Les theories ont leur.s commencements: des allusions vagues, des essais inacheves, des problemes particuliers; et meme lor.sque ces commencements importent peu dans l'etat actuel de la Science, on aumit tort de les passer SOU8 silence. F. Riesz, Les systemes d'equations lineaires a une infinite d'inconnues, Paris, 1913, p. 1. Scientific subjects do not pj'ogress necessarily on the lines of direct usefulness. Very many applications of the theories of pure mathematics have come many years, sometimes centuries, after the actual discoveries themselves. The weapon . were at hand, but the men were not able to use th.em..

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