any() and all() on empty list?
Wed Mar 29 10:00:09 CEST 2006
Ron Adam <rrr at ronadam.com> writes:
> In this view and empty set can be True for all(). Is it posible
> 'all()' is undefined? Here, none() and all() return contradicting
> values. So maybe the correct version may be...
I don't see any contradiction. all() and none() are both true.
Anyway, this has all been discussed before in a slightly different context:
Harary, F. and Read, R. "Is the Null Graph a Pointless Concept?" In
Springer Lecture Notes in Math. 406 (1974) 37-44
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