Timeline for Is there a standard name for (non-square) matrices with orthonormal columns?
Current License: CC BY-SA 3.0
6 events
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| Sep 14, 2017 at 15:04 | comment | added | Peter Heinig | @Turbo: yes, but Plesken's Proposition 2.2 is valid (and explicitly stated) for any matrix $X\in\mathbb{R}^{n\times k}$, the specific title of the paper notwithstanding. | |
| Sep 14, 2017 at 14:27 | comment | added | Turbo | aren't the only integer orthogonal matrices signed permutations? | |
| Sep 14, 2017 at 7:14 | history | edited | Peter Heinig | CC BY-SA 3.0 |
Both a numerical check and a brief proof-attempt of mine for **3.** did not work out. No time to treat this carefully. Therefore, I simply deleted remark **3.**
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| Sep 12, 2017 at 17:19 | history | edited | Peter Heinig | CC BY-SA 3.0 |
Added a property that I conjecture to be a necessary one for the matrices the OP was asking about.
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| Sep 12, 2017 at 17:14 | history | edited | Peter Heinig | CC BY-SA 3.0 |
Added a property that I conjecture to be a necessary one for the matrices the OP was asking about.
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| Sep 12, 2017 at 16:52 | history | answered | Peter Heinig | CC BY-SA 3.0 |