On Tue, Dec 29, 2009 at 12:28:46PM +0000, John Cremona wrote:
> 2009/12/29 Nathann Cohen <nathann.co...@gmail.com>:
> > Excellent ! Then
> >
> > __builtin__.sum([g,h],Graph())
> >
> > does the job.. Thank you :-)
Just 2 cents: in our code, we systematically use the following feature
from additive monoids:
sage: M = CommutativeAdditiveMonoids().example()
sage: M
An example of a commutative monoid: the free commutative monoid
generated by ('a', 'b', 'c', 'd')
sage: a,b,c,d = M.additive_semigroup_generators()
sage: M.sum([a,b,c])
a + c + b
The advantage compared to using a coercion 0 -> M is that:
sage: M.sum([]).parent() is M
True
In this spirit, maybe we could have Graph.sum([g,h]).
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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