[sage-support] Re: Parallelization of contractions

[Eric Gourgoulhon]

Le mercredi 22 janvier 2020 07:43:52 UTC+1, Mattia Villani a écrit :
>
> How to use parallelization on contraction of tensor? Consider the case I 
> have two successive contraction like this:
>
> Tud=etuu['^{ab}']*eamup['^c_b']
> Tp=Tud['^{ab}']*eamup['^c_a']
>
> How con I parallelize it?
>

It suffices to type, before your code for contraction:


Parallelism().set(nproc=8)


Then the calculus of the contactions will be parallelized on 8 processes.
Of course, you can adapt the value of nproc to your computer.
An example is here 

.

Best wishes,

Eric.


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[sage-support] Re: Endomorphism Rings of Elliptic Curves

[Eric Zhu]

In the ordinary case, is it possible to get the regular function 
corresponding to some endomorphism?

On Wednesday, January 22, 2020 at 1:40:54 PM UTC-5, John Cremona wrote:
>
> I suspect the question might have been referring to elliptic curves over 
> finite fields. In the ordinary case you can ask for the Frobenius order and 
> know that the endomorphism ring is between that and the maximal order of 
> its field of fractions (an imaginary quadratic field) but as far as I know 
> Sage jas no implementation of finding the exact endomorphism ring such as 
> Kohel's algorithm.

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[sage-support] Re: Endomorphism Rings of Elliptic Curves

[John Cremona]

I suspect the question might have been referring to elliptic curves over finite 
fields. In the ordinary case you can ask for the Frobenius order and know that 
the endomorphism ring is between that and the maximal order of its field of 
fractions (an imaginary quadratic field) but as far as I know Sage jas no 
implementation of finding the exact endomorphism ring such as Kohel's algorithm.

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