Ron Adam <[EMAIL PROTECTED]> 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 -- http://mail.python.org/mailman/listinfo/python-list
