Other philosophers are also explicit that “conceptual analysis” issues in synthetic claims, but simultaneously regard it as a source of a priori knowledge (e.g. Jenkins 2008, 2012). This combination of views is less straightforward. In particular, it seems open to the traditional query: how is such synthetic a priori knowledge possible? If some claim is not guaranteed by the structure of our concepts, but answers to the nature of the world, then how is it possible to know it without a posteriori evidence?