Deutsch's unproven theorem paradox

So some scientist 10 years in the future (Nerd A) sends the proof of a mathematical theorem, which he copied from Book B back in time. The scientist at the LHC (Nerd B) writes this down and gets it published in a book (Book B). Where did the proof of the theorem come from?

Good luck with that one.

Still no blu-ray!

Even though Apple are listed as a contributor to the Blu-ray Disc Association.

Think I'll stick with my Sony Vaio.

Bad Apple!