Georg Brandl wrote: > Steven D'Aprano wrote: >>all(flying elephants which are pink) => true >>all(flying elephants which are not pink) => true >> >>So, these flying elephants -- are they pink or not? > > No, you ask two different sets whether they are true.
No, there is only one empty set. Relevant to this discussion is stuff about syllogisms concerning non-existent objects and what C.S. Peirce did to them in the 19th century. See e.g. http://www.math.fau.edu/schonbek/mfla/mfla1f01syl.html#tth_sEc5 Marcin -- http://mail.python.org/mailman/listinfo/python-list
