Timeline for When a Unitary matrix times its complex conjugate is diagonal
Current License: CC BY-SA 3.0
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| Aug 11, 2016 at 22:42 | comment | added | batconjurer | Well, as I mentioned in the question, it's not hard to see that $D^2=I $ iff $D$ commutes with U. But any diagonal unitary satisfying $D^2=I $ can only have $\pm1$ on the diagonal and so is real. | |
| Aug 11, 2016 at 16:11 | history | edited | Josu Etxezarreta Martinez | CC BY-SA 3.0 |
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| Aug 11, 2016 at 15:25 | history | answered | Josu Etxezarreta Martinez | CC BY-SA 3.0 |