Timeline for Tri-coloring of E8 lattice? Why is the Gram matrix of E8 not unique?
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 9, 2023 at 22:04 | history | protected | CommunityBot | ||
| Sep 30, 2021 at 1:36 | comment | added | Dan Haxton | Thanks Martin mathoverflow.net/users/105705/martin-seysen. The matrix A that relates the two Gram matrices, computed by e.g. qfisom pari.math.u-bordeaux.fr/dochtml/html/… has a Jordan normal form, which seems to be the fundamental thing relating the two indexing conventions for the same points in space corresponding to the two Gram matrices. See Henry Cohn's mathoverflow.net/users/4720/henry-cohn answer below. The Jordan form of A seems to summarize the symmetry involved. Is there something more fundamental? | |
| Sep 26, 2021 at 3:19 | answer | added | Henry Cohn | timeline score: 7 | |
| S Sep 25, 2021 at 4:47 | history | suggested | Somos | CC BY-SA 4.0 |
Fixed obvious typos.
|
| Sep 25, 2021 at 2:00 | review | Suggested edits | |||
| S Sep 25, 2021 at 4:47 | |||||
| Sep 24, 2021 at 22:14 | comment | added | Martin Seysen | If I am not misleaded, the Gram matrix of a lattice corresponds to a bilinear form. On the other hand, an Eigenvalue is a property of a transformation matrix, but not of a bilinear form. | |
| Sep 24, 2021 at 21:42 | history | edited | LSpice | CC BY-SA 4.0 |
Name of paper
|
| S Sep 24, 2021 at 19:52 | review | First questions | |||
| Sep 24, 2021 at 19:56 | |||||
| S Sep 24, 2021 at 19:52 | history | asked | Dan Haxton | CC BY-SA 4.0 |