To be sure.
And so when he says 'If one is not' he clearly means, that what 'is not' is other than all others; we know what he means—do we not?
Yes, we do.
When he says 'one,' he says something which is known; and secondly something which is other than all other things; it makes no difference whether he predicate of one being or not-being, for that which is said 'not to be' is known to be something all the same, and is distinguished from other things.
Certainly.
Then I will begin again, and ask: If one is not, what are the consequences? In the first place, as would appear, there is a knowledge of it, or the very meaning of the words, 'if one is not,' would not be known.
True.
Secondly, the others differ from it, or it could not be described as different from the others?
Certainly.
Difference, then, belongs to it as well as knowledge; for in speaking of the one as different from the others, we do not speak of a difference in the others, but in the one.