Perhaps the seed of doubt is starting to creep into his mind eh...?
AP: no, and it is either very disengenious of you to suggest that, or you are not very well educated.
You should know that our system of science and logic and rational thought does not allow a negative to be proven.
It's that simple.
PS If we
could prove a negative, I suggest that we wouldn't be having this conversation! (edited to add: one way or another!)