Comment by ndriscoll

My comment was exactly about the required math background though. Anyone who's completed an intro to proof class would find that kind of statement easy to formalize because they would have had to write similar statements for homework. That provides some context: everyone who's interested in computer theorem provers probably has some experience with proofs, so formalizing that statement should be easy for them. i.e. (for this kind of problem) it's not really "the hard part" for people who are seriously working on this stuff.