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Apr 22, 2016 at 19:20 vote accept Dmitry Kerner
Jan 15, 2016 at 18:47 comment added Dmitry Kerner Excellent, thanks! Still: what about the biggest ideal $J$, satisfying $Span(UA+AU^T)\supseteq Mat^{skew−sym}(n,J)$? Is this also written down somewhere?
Jan 15, 2016 at 18:26 history answered Robert Bryant CC BY-SA 3.0