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May 14, 2014 at 6:47 history edited András Bátkai CC BY-SA 3.0
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May 4, 2014 at 19:01 comment added András Bátkai @FrancoisZiegler: Well, you are right, I might have been misled by the "modern version of Riesz-von Neumann decomposition of unity" expression.
May 4, 2014 at 18:43 comment added Francois Ziegler I believe this is the passage you're referring to in Dieudonné -- but then, I don't see an attribution (of the diagonalization idea) to von Neumann there.
May 4, 2014 at 8:58 history answered András Bátkai CC BY-SA 3.0