17.11.2012 10:47, Daniel J. Greenhoe kirjoitti: > Thank you very much Kaba and Jesse for your help. I appreciate it. > > If it really does come down to convention, maybe for me it would be best that I just give all 4 of the criteria rather than have to first state what convention I am assuming for the set operations.
That's one possibility. For me, this is another example of why it is always important to define boundary cases correctly in a definition: it cuts down the complexity of whatever uses that definition.