Timeline for One question on circulant $\pm1$ matrices
Current License: CC BY-SA 4.0
10 events
| when toggle format | what | by | license | comment | |
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| Nov 20, 2022 at 6:11 | vote | accept | user369335 | ||
| S Nov 13, 2022 at 13:25 | history | suggested | user369335 | CC BY-SA 4.0 |
According to Corollary 2.5 in the Jungnickel and Pott paper
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| Nov 13, 2022 at 7:04 | review | Suggested edits | |||
| S Nov 13, 2022 at 13:25 | |||||
| Nov 13, 2022 at 0:08 | history | edited | kodlu | CC BY-SA 4.0 |
added 192 characters in body
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| Nov 11, 2022 at 22:25 | history | edited | kodlu | CC BY-SA 4.0 |
added 134 characters in body
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| Nov 11, 2022 at 21:54 | history | edited | Rodrigo de Azevedo | CC BY-SA 4.0 |
edited body
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| Nov 11, 2022 at 19:52 | history | edited | kodlu | CC BY-SA 4.0 |
added 128 characters in body
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| Nov 11, 2022 at 19:51 | comment | added | kodlu | Indeed, that's what I am referring to as Legendre sequences they are derived from quadratic characters. Thanks for pointing this out. | |
| Nov 11, 2022 at 19:45 | comment | added | Maarten Havinga | For an explicit construction of example circulant matrices $X$ where $X^T X = (n+1)I - J$, try for a finite field with $n=4k+3$ elements and specify $X(i,j)=sgn(i-j)$ where $sgn(x)=1$ iff $x$ is a square modulo $n$ and $-1$ otherwise. | |
| Nov 11, 2022 at 17:50 | history | answered | kodlu | CC BY-SA 4.0 |