Idiots like me may say, "no, the hypothesis 0 =/= 0 is unprovable".
Do you mean "are some truths unprovable?"? I don't know. Some may claim that the truths of mathematics ae just those statements that are provable.
> Or do they all have a proof that is > just not found yet? The Riemann hypothesis comes to mind.
Let's suppose that RH is true. "RH is unprovable" may mean various things: (1) Humans could prove it were it not for the fact that they will become extinct before they do so. (And that "could" means what?) (2) Humans can't prove it because their brains are too feeble. (But the giraffe-like beings on planet Scorrrf (my keyboard doesn't have the diacritics that the first and third "r"s should have) prove it as homework in their first year a school.) (3) A computer (built and programmed by another computer) proved it after running for sixty years, but no one is foolhardy enough to claim that they understand what that computer is doing or that it is bug-free. (4) No machine or creature in this universe or any other will ever prove it.
What about the continuum hypothesis in place of RH?
-- The animated figures stand Adorning every public street And seem to breathe in stone, or Move their marble feet.