i`ll put it this way: - step a: This sentence is false. This means that what it communicates is false. This implies - step b: It is false that this sentence is false. <=> This sentence is true. - step c: ... and so on.. The steps a and b are contradictory. And contradictory are also any other tow cosecutive steps of this chain. If one has value 1 the other -1. But you should think in "base 2" so to speak, in boolean logic... Nomater what value you find (0, 22 or infinity or whatever..) if it is different from the base values (1 and -1) wich correspond to (true and false) the value you find has no meaning. For example: the value you found: infinity. how can you interpretate this value ? what does it meen ? true or false ?