#6630: The empty species exists !!!
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Reporter: hivert | Owner: hivert
Type: defect | Status: new
Priority: major | Milestone: sage-4.1.1
Component: combinatorics | Keywords: species zero
Reviewer: | Author:
Merged: |
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I'm writing a patch which create the empty species. Before the patch I
didn't find any way to create it...
It is the species which contains no structure at all and as such does not
seems very useful. However, it is the zero of the semi-ring of the species
and may be needed when you do computation on species, for example to give
the default value for the function sum()...
And this is yet another patch from me about empty objects :)
Florent
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6630>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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