  If, on the other hand, both O1 and O2 are known to x, then x can perhaps make some judgements about O1 and O2; but not the false judgement that “O1 is O2.” If x knows O1 and O2, x must know that O1 is O1 and O2 is O2, and that it would be a confusion to identify them. So apparently false belief is impossible if the judger does not know both O1 and O2; but also impossible if he does know both O1 and O2.  