Re: Is {{}} a valid construct?

Suppose I have a box that contains an apple and orange and I want to represent the box's content and not any part of the box. Using set theory, it would look like this:

U = {apple, orange}

Next I add nothing to the box. From discussion in this thread, it appears all here, expect me, would would represent it as follows because nothing is treated as something:

U = {apple, orange, {}}

Now I do a reality check. I count the number of things in the box and get 2. I count the number of elements in the set and I get 3 :( Received on Tue Feb 06 2007 - 21:18:56 CST