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Continue to Chat... The approach of von Neumann and Connes to the use of non-commutative algebra in physics is naive, the situation is much more complicated. - Israel Gelfand from https://whatsmyquote.com/quote/the-approach-of-von-neumann-and-connes-to-the-use-of-non-commutative-algebra-in-physics-is-naive-the-situation