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May 16, 2017 at 19:20 comment added user35593 there are counterexamples even for k=3. e.g. X=[1 2;;1 1;1 1], D1=D3=diag (10,1,1) and D2=I_3
May 11, 2017 at 10:29 history edited Janak CC BY-SA 3.0
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May 11, 2017 at 10:20 history asked Janak CC BY-SA 3.0