2016-11-29 11:36:49 UTC+1, John Cremona:
> You are asking for help in debugging your own Weil pairing code. Why
> not use the Weil pairing code implemented in Sage?
>
> In your example
>
> sage: P.weil_pairing(Q,5)
> 242
> sage: _^5
> 1
>
> (since P and Q have order 5 the result is a 5th root of unity in the
field).
>
> I don't have time to debug your code but you should be able to write
> it using genuine polynomials; your var('x') etc give symbolic objects
> which are not good to use over a finite field.
>
> John Cremona
Excellent answer, John!
Regarding debugging, the question was also posted at ask-sage
and I aswered there with
- a fix to the original poster's code
- a minimal example triggering the segfault
The segfault boils down to a problem when dividing symbolic
expressions involving finite field elements.
See Ask Sage:
https://ask.sagemath.org/question/35770/getting-code-dumped-error-in-sage-code-for-weil-pairing/
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