On 2015-06-09 13:18, Nathann Cohen wrote:
There can be debates about this rule, and how far we are from having
implemented it everywhere; but the rule is clear and simple.
Fortunately, it is not at all like this in practice. Or we would have
to switch constantly from one file in combinat/poset/ to its
equivalent counterpart in category/ in order to implement something.
And we would never know which function should be in which file, for it
depends after all on how it is implemented.
You're forgetting sage/structure/element.pyx which *also* implements
some operations (for example, sqrt() and is_prime() for ring elements)
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