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Aug 20, 2019 at 18:56 comment added Durzot @Denis Serre thank you for your answer, I was not aware of the theorem you mentioned and I am happy to discover it. The post indicated by Robert Israel is also a solution for a more general problem.
Aug 20, 2019 at 18:53 comment added Denis Serre @LSpice. It isn't. Using a result valid for a more general situation is often a good way to understand what is going on. And the general result is interesting in its own.
Aug 20, 2019 at 18:51 history edited Denis Serre CC BY-SA 4.0
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Aug 20, 2019 at 16:45 comment added LSpice Surely this is far too complicated for something that can be proven by row and column manipulations ….
Aug 20, 2019 at 16:27 history answered Denis Serre CC BY-SA 4.0