Timeline for Obstructions to Smith normal form of a special type
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 11, 2014 at 15:02 | comment | added | Richard Stanley | The matrix came from solving the equations $ad-bc=1$, gcd$(a-1,b,c,d-1)=r$, $(a-1)(d-1)-bc=r^2s$. I made the simplifying assumption $b=d=r$, $a-1=\alpha r$, $d-1=\delta r$ and solved. | |
| Jan 11, 2014 at 4:41 | comment | added | Igor Rivin | And it does the $Sp(2n, \mathbb{Z}) case, since $SL(2) = Sp(2).$ Truly you are wise in the ways of science. | |
| Jan 11, 2014 at 3:23 | comment | added | Igor Rivin | So, presumably that resolves the $SL(n)$ question for any even $n,$ by using this construction in blocks. Does this matrix come from somewhere, or did it just occur to you? | |
| Jan 11, 2014 at 3:17 | history | answered | Richard Stanley | CC BY-SA 3.0 |