Timeline for Computer program which computes the automorphism group of Gram Matrix of lattice?
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
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| Jan 27, 2021 at 20:08 | comment | added | en kuo | @WillJagy, thanks. But I may need to solve that for the 6 by 6 matrix K. I will check the post. | |
| Jan 27, 2021 at 18:46 | comment | added | Will Jagy | see mathoverflow.net/questions/141284/… | |
| Jan 27, 2021 at 18:21 | comment | added | Will Jagy | for a binary with dicriminant positive but not a square, there is an explicit recipe once we solve $x^2 - \Delta y^2 = 4.$ I like treatment in Buell, Binary Quadratic Forms. I wrote my own software for dimension 3 and 4. For indefinite, I just tell it an upper bound on the entries (absolute value). Not hard. I also allow different quadratic forms, so, given symmetric integer $G,H$ I program $kH=P^t G P$ where $k$ is an integer constant I choose. Useful for many things. | |
| Jan 27, 2021 at 16:41 | history | edited | en kuo | CC BY-SA 4.0 |
added 201 characters in body
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| Jan 27, 2021 at 15:51 | history | edited | LSpice | CC BY-SA 4.0 |
Proofreading; deleted "I will be appreciative"
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| Jan 27, 2021 at 15:43 | history | asked | en kuo | CC BY-SA 4.0 |