#8519: Add a factory of finite/infinite enumerated set (with categories) defines
by Range(begin, end, step)
-----------------------------+----------------------------------------------
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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Changes (by nborie):
* keywords: positive integer => range, categories, set, integer
Old description:
> We have already a proper set with category of NonNegativeIntegers, let's
> use it to also define PositiveInteger
>
> {{{
> sage: NonNegativeIntegers()
> Non negative integers
> sage: PositiveInteger()
> ---------------------------------------------------------------------------
> NameError Traceback (most recent call
> last)
>
> /home/nicolas/<ipython console> in <module>()
>
> NameError: name 'PositiveInteger' is not defined
> }}}
New description:
A general tool to define:
- PositiveInteger
- NonNegativeInteger
- More.....
The idea is :
Range(begin, end, step) returns a proper finite/infinite set with
categories of the defined set as you think...
(12:37:41) hivert: For example but not only: Range(5, 2^1321312, 3)...
(12:38:09) hivert: Range(0, Infinity, 1) <=> NonNegativeIntegers
(12:38:18) hivert: Range(1, Infinity, 1) <=> PositiveIntegers
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8519#comment:2>
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