#14110: Speed Up Poset Generation
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Reporter: csar | Owner: csar
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.4
Component: combinatorics | Resolution:
Keywords: posets | Merged in:
Authors: | Reviewers: Thierry Monteil
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by jdemeyer):
Replying to [comment:14 jmantysalo]:
> I asked from Brendan McKay "Nauty.h contains copyright with 'exception
of sale for profit or application with nontrivial military significance.'
Does this apply to whole package?" and he answered: "It applies to all of
the nauty files, but for incorporation into Sage you can ignore it.
Any idea what "It applies to all of the nauty files, but for incorporation
into Sage you can ignore it" actually means? The problem is that it really
needs to be GPL v3 to be standard in Sage. And once it's GPL, it's GPL for
everybody, not just for Sage.
The "sale for profit" isn't an unlikely scenario given William Stein's
plans to make money from SMC.
Final remark: it's allowed by the GPL to run Sage and nauty as separate
programs (using Python's `subprocess` for example), but not to link nauty
as a library.
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Ticket URL: <http://trac.sagemath.org/ticket/14110#comment:23>
Sage <http://www.sagemath.org>
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