On Wed, Mar 24, 2021 at 9:11 AM nqn...@gmail.com wrote:
>
> El miércoles, 24 de marzo de 2021 a las 10:01:43 UTC+1, matt...@gmail.com
> escribió:
>>
>> I think the author uses "present" to say "generate"
>>>
>>>
>
> I suppose you mean the finitely generated Z-module (abelian group) presented
> b
El miércoles, 24 de marzo de 2021 a las 10:01:43 UTC+1, matt...@gmail.com
escribió:
> I think the author uses "present" to say "generate"
>
>>
>>
I suppose you mean the finitely generated Z-module (abelian group)
presented by the matrix, ie. its cokernel. In that case, you can do:
sage: A=matri
I think the author uses "present" to say "generate"
Il giorno mercoledì 24 marzo 2021 alle 09:35:05 UTC+1 vdelecroix ha scritto:
> 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.
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 vdelec
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 genera
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
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 wrote:
> >
> > Is
On Tue, Mar 23, 2021 at 2:00 PM Mattia Villani wrote:
>
> Is is possible to find the group given the matrix presentation?
Please be more specific. Post some Sage commands you're trying.
>
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Is is possible to find the group given the matrix presentation?
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