#7422: New Incidence Structure and Block Design constructions
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Reporter: brett | Owner: mhansen
Type: enhancement | Status: new
Priority: major | Milestone:
Component: combinatorics | Keywords: Block Design, Incidence Structure,
Residual, Derived, Complement, Supplement, Point Deletion
Work_issues: | Author: Brett Stevens
Reviewer: | Merged:
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I have added two references; fixed the points() method to return points in
lexicographic order so __eq__ works properly; made is_simple() its own
standalone method and call it from block_design_checker and added the
following constructions: Derived at a Point, Residual at a Point, Derived
at a Block, Residual at a Block, Complementary, Supplementary, Point
Deletion and Extraction of Blocks by size.
Some relevant discussion is here:
http://groups.google.com/group/sage-
devel/browse_thread/thread/305158ab5d3181bc
Reviewers:
- Please think about my first item on the TODO list; is that a better way
to proceed with derived_blck and residual_blck?
-I do not know whether this is "Minor" or "Major" (I am pretty sure it is
not the others) so I have put "Major". Please tell me if I was wrong.
- I have no idea what to put in Milestone so I have left it blank.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7422>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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