 Consider a non-numerical example, also highly simplified but quite topical in the light of the recent rise in status of the concept of fundamentality. Suppose you are interested in the truth about which particles are fundamental. At the outset of your inquiry all you know are various logical truths, like the tautology either electrons are fundamental or they are not. Tautologies are pretty much useless in helping you locate the truth about fundamental particles. Suppose that the standard model is actually on the right track. Then, learning that electrons are fundamental edges you a little bit closer to your goal. It is by no means the complete truth about fundamental particles, but it is a piece of it. If you go on to learn that electrons, along with muons and tau particles, are a kind of lepton and that all leptons are fundamental, you have presumably edged closer.