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Timeline for minimize with orthogonal constraint

Current License: CC BY-SA 3.0

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Jun 25, 2017 at 23:11 comment added Q-Y @fedja oh. I see. Thank you very much. I did not think about that.
Jun 25, 2017 at 19:46 comment added fedja Certainly not, as posed. Imagine the case when the whole set $U_1\cup U_2$ is orthonormal. Then the norm to minimize does not depend on $O$ at all.
Jun 25, 2017 at 2:58 history edited Q-Y CC BY-SA 3.0
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Jun 24, 2017 at 9:12 history edited YCor
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Jun 24, 2017 at 8:40 history asked Q-Y CC BY-SA 3.0