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Dec 23, 2019 at 17:42 history edited Jochen Glueck CC BY-SA 4.0
I adjusted the answer to the new version of the question.
Dec 21, 2019 at 0:32 comment added fidaleo Many thanks Jochen
Dec 21, 2019 at 0:24 comment added Jochen Glueck @fidaleo: Thanks for the edit! This makes the question much more interesting, of course. I'll think about it...
Dec 21, 2019 at 0:23 comment added fidaleo Another good example might be something satisfying the question I raised, plus the condition that the peripheral spectrum includes properly 1.
Dec 21, 2019 at 0:12 comment added fidaleo Now it seems that the question is ok
Dec 21, 2019 at 0:08 comment added Jochen Glueck @fidaleo: Alright, then I suggest that you edit your question in order to describe more precisely what you are looking for / how involved the example should be.
Dec 21, 2019 at 0:05 comment added fidaleo Many thanks, I was knowing such an example, but I was searching for something more involved
Dec 20, 2019 at 23:57 history answered Jochen Glueck CC BY-SA 4.0