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Oct 20, 2016 at 19:25 comment added Federico Poloni There was a question here on MO about a matrix with a very similar structure (two stacked blocks with $D \otimes vector$), but unfortunately I can't find it now. :( I don't recall any conclusive answer on that thread, though.
Oct 20, 2016 at 19:19 history asked Memming CC BY-SA 3.0