
Originally Posted by
<<>> Let's consider that set A is the set of all the sets that can be described with less than 10 words. I have described set A with 16 words, which is more than 10 words, and so, it doesn't enters the requiermnets of itself (being described with more than 10 words) and so it doesn't contains itself. Now, let's consider set R the set of all sets that don't contain themselves. Such as the set of all dogs (which isn't itself a dog) or the set previously described (set A). Then, doesn R contain itself? If it contains itself, it must not contain itself, and if it doesn't contain itself, it must contain itself.