What does it mean "it presents Z5"?
Le 24/03/2021 à 09:28, Mattia Villani a écrit :
That matrix comes from the paper by J.Hempel: "Homology of covering" Pac.
J. Math. vol 112 (1984) 83, example 5.2.
The author says that it presents Z5
Il giorno mercoledì 24 marzo 2021 alle 08:50:18 UTC+1 vdelecroix ha scritto:
Your matrix has determinant 4 - 9 = -5. Hence, the group it generates
in GL(2,QQ) is necessarily infinite.
Le 24/03/2021 à 08:47, Mattia Villani a écrit :
I do not have real code, only a matrix:
matrix([[1,-3],[-3,4]])
which should be a representation of the group Z5: I want to verify it
with
Sage
Il giorno martedì 23 marzo 2021 alle 17:18:12 UTC+1 dim...@gmail.com ha
scritto:
On Tue, Mar 23, 2021 at 2:00 PM Mattia Villani <matt...@gmail.com>
wrote:
Is is possible to find the group given the matrix presentation?
Please be more specific. Post some Sage commands you're trying.
--
You received this message because you are subscribed to the Google
Groups "sage-support" group.
To unsubscribe from this group and stop receiving emails from it, send
an email to sage-support...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/sage-support/348e69d5-b3a5-45c4-a7ec-baed9213f6dcn%40googlegroups.com
.
--
You received this message because you are subscribed to the Google Groups
"sage-support" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sage-support+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/sage-support/0727a2a9-0510-d164-00c6-450b641be317%40gmail.com.
