1 + 1 = 2 is a definition of 2, as the successor of 1. It is not a particularly fundamental one, as we can do arithmetic without it, just not in any base > 2.
Definitions are axioms, and they are inescapable in philosophy. Rationality cannot get you any further than what follows from your axioms.
Definitions are axioms, and they are inescapable in philosophy. Rationality cannot get you any further than what follows from your axioms.