Let me help you.
A = "temporary claim"
~A = NOT "temporary claim"
A AND ~A is a contradiction.
I need to preface this post with the disclaimer that I do not usually resort to empty posturing, but it seems to be necessary in this particular case.
Doron. I have mentioned this before. I have studied computer science. I have studied advanced mathematics. I know how these things work.
You don't. You
demonstrably don't. The post that I'm replying to here is proof of that.
Stop trying to educate others and try to learn something yourself.
~ is the negation symbol. ~A is true only if A is false. ~A can be expressed as the inverse of A; for example, if A is "the sky is blue", ~A is "the sky is not blue".
Belz' statements were "reality is material in nature" and "we can't be absolutely certain of anything". Setting aside for the moment whether or not these statements are true, let us designate them A and B, respectively.
~A, therefore, is "reality is
not material in nature", and ~B is "we
can be absolutely certain of things".
You have taken declared that Belz has claimed "A AND ~A".
What he has actually done is claim "A AND B".
There is no contradiction.
Read.