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Aug 23, 2020 at 19:59 comment added Benjamin Steinberg If nobody can find a reference for the general case I will go with this one.
Aug 23, 2020 at 16:51 comment added Benjamin Steinberg Thanks. I'll look at the book. It would be nice if the general case was stated since it is annoying to say they prove it in a special case but the same proof works.
Aug 23, 2020 at 15:54 history answered Mare CC BY-SA 4.0