David:If that is the case, how does Romansh prove anything? Do you accept the ability to provide proofs? > > Romansh: Romansh does not prove anything in real life. In logic puzzles romansh accepts axioms and logic rules. In that context I will accept a proof.-I've never had formal training in logic. I assume you have proof you exist. If the appple falls on your head do you assume gravity, or simmply propose the theoretical existence of a gravitional force? This is not a facetious comment. I am trying to define how you accept proof in science.