 According to the first principle, sentences are analytic relative to a language framework \(\mathbf{L}\) when their truth follows from its grammar and vocabulary alone. In English, “Bachelors are unmarried” cannot be false, since “bachelor \(=_{\df}\) unmarried, adult male”. Sentences of this kind make no claims about the world, but instead reflect features of the linguistic framework as syntactical or semantic truths in \(\mathbf{L}\). And sentences are synthetic when they make claims about the world. Their truth in \(\mathbf{L}\) does not follow from its grammar and vocabulary alone but hinges upon properties of the world and its history. According to logical positivism, all such claims about the world have to be evaluated on the basis of experience, which means the kind of knowledge they display is a posteriori. But kinds of knowledge whose truth can be established independently of experience are a priori.