#10181: speed up AbelianGroup().subgroups()
----------------------------+-----------------------------------------------
   Reporter:  zimmerma      |       Owner:  joyner  
       Type:  enhancement   |      Status:  new     
   Priority:  minor         |   Milestone:  sage-4.6
  Component:  group theory  |    Keywords:          
     Author:                |    Upstream:  N/A     
   Reviewer:                |      Merged:          
Work_issues:                |  
----------------------------+-----------------------------------------------
Changes (by thome):

  * priority:  major => minor


Comment:

 The culprit is really the constructor AbelianGroup_subgroup. It does the
 work again and again and again... Only for expository purpose, in the
 attached code (which does about the same thing as the subgroups() method
 anyway), the data shipped to the constructor is already in smith form, yet
 it takes ages to chat with gap, have it compute the smith form again,
 parse, etc, etc.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10181#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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