#19364: Add edges() and endpoints() method to intervals
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Reporter: jdemeyer | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.10
Component: basic arithmetic | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/add_edges___method_to_rif_and_cif_elements|
388d495a093e551084e137f947e51ad74f6e0100
Dependencies: | Stopgaps:
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Description changed by jdemeyer:
Old description:
> Add an `edges()` method to intervals (elements of `RIF` and `CIF`).
>
> 1. For complex intervals, return the 4 edges of the rectangular interval
> as intervals.
> 1. For real intervals, return the endpoints as intervals.
>
> For `CIF`, we also add an `endpoints()` method returning the 4 corners of
> the interval.
>
> In other words, if the given interval lives in some N-dimensional space,
> then:
> 1. `edges()` returns the (N-1)-dimensional faces.
> 1. `endpoints()` returns the 0-dimensional faces.
New description:
Add an `edges()` method to intervals (elements of `RIF` and `CIF`).
1. For complex intervals, return the 4 edges of the rectangular interval
as intervals.
1. For real intervals, return the endpoints as single-point intervals.
For `CIF`, we also add an `endpoints()` method returning the 4 corners of
the interval.
In other words, if the given interval lives in some N-dimensional space,
then:
1. `edges()` returns the (N-1)-dimensional faces as intervals.
1. `endpoints()` returns the 0-dimensional faces as points.
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Ticket URL: <http://trac.sagemath.org/ticket/19364#comment:6>
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