#8519: Add a factory of finite/infinite enumerated set (with categories) defines
by Range(begin, end, step)
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   Reporter:  nborie         |       Owner:  nborie                         
       Type:  enhancement    |      Status:  new                            
   Priority:  major          |   Milestone:  sage-4.3.4                     
  Component:  combinatorics  |    Keywords:  range, categories, set, integer
     Author:                 |    Upstream:  N/A                            
   Reviewer:                 |      Merged:                                 
Work_issues:                 |  
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Comment(by nborie):

 So guys,

 I add a patch with a first implementation...

 Questions:
 - First, if you find a language mistake, please tell me.
 - What should I keep, what should I drop in NonNegativeIntegers ?
 - Does IntegerRange need an _element_constructor_ method ?
 - What should I had in PositiveIntegers (easy thing please) ?
 - Do you want to tell me about your day ?
 - Any comment ....

 Thanks for further advises.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8519#comment:8>
Sage <http://www.sagemath.org>
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