#16231: Equivalence between OA/TD/MOLS
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Reporter: | Owner:
ncohen | Status: needs_review
Type: | Milestone: sage-6.2
enhancement | Resolution:
Priority: major | Merged in:
Component: | Reviewers:
combinatorics | Work issues:
Keywords: | Commit:
Authors: | a9dce705211f5593b926c0512a40ada05d978ff3
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
u/ncohen/16231 |
Dependencies: |
#15310, #16227 |
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Comment (by ncohen):
Okay, I agree with your modifications except one :
{{{
+ if availability:
+ return False
+ from sage.categories.sets_cat import EmptySetError
+ raise EmptySetError("No Transversal Design exists when k>=n+2")
}}}
We shouldn't duplicate non-existence results but rather forward them, in
this case forward it from OA to TD.
The nice thing is that later we will be able to implement a 'non-existence
result' exactly like a construction !!
A 'non-existence result' will be a function taking a "k,n,existence=" as
parameter, which can sometimes return "False" as an answer instead of
"Unknown" `;-)`
Thiiiiiiiiiis code will become *COOL*.
Nathann
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Ticket URL: <http://trac.sagemath.org/ticket/16231#comment:8>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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