#6886: Elliptic curve isogeny checking can be expensive
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   Reporter:  cremona          |       Owner:                        
       Type:  defect           |      Status:  positive_review       
   Priority:  minor            |   Milestone:  sage-4.1.3            
  Component:  elliptic curves  |    Keywords:  elliptic curve isogeny
Work_issues:                   |      Author:  wuthrich              
   Reviewer:  cremona          |      Merged:                        
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Changes (by newvalueoldvalue):

  * status:  needs_review => positive_review
  * reviewer:  => cremona
  * author:  => wuthrich


Comment:

 The patches look good, apply to 4.1.2.rc0 and all elliptic curves tests
 pass.  Even better, the patch I am currently working on for #6887 applies
 fine on top of these, and I will make anything I post at #6887 depend on
 this one.  It may happen that I further develop the checking code on that
 ticket, but this is good to go in now -- it can get into 4.1.2 while the
 new stuff in #6887 had better wait since it does a lot of new stuff.

 I have been thinking of a better way of testing the validity of a kernel
 polynomial, and currently have an idea (not implemented ) which would work
 in the case of a cyclic kernel.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6886#comment:5>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
and MATLAB

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