Hello! As you can check here http://mathoverflow.net/questions/120536/is-the-empty-graph-a-tree
the big shot guys agree that the empty graph is to be considered disconnected. So YES in general, mathematicians appear to be depressed persons..... On Mon, Aug 19, 2013 at 5:51 PM, Nathann Cohen <nathann.co...@gmail.com>wrote: > Helloooooooo everybody !! > > There is a discussion on theology going on at #15060, about whether we > should consider whether the empty graph is connected or not. We > already had one about deciding whether the empty graph is a tree or > not, and Karl-Dieter supposed that other discussions of this kind > already happened in Sage. > > Here's the thing : we have two definitions which conflict on a trivial > case only, and we have functions that are expected to answer whether > -- yes or no -- the property holds. > > I personally voted for not answering anything, and raising a "We Have > No Idea And We Don't Want To Be Forced To Give An Answer Exception" in > this case, for there is no way to give an answer that would not lead > anybody to very weird bugs. > > What do you think ? Darij agreed with this idea, and Karl-Dieter > believes that we should make a decision and answer something :-) > > Help us ! :-P > > Nathann > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/groups/opt_out.
