 It is noteworthy that this way of putting things is contentious and possibly misleading; after all, on a technical understanding theories are sets of sentences. The notion of a theory is thus a “linguistic”, rather than an epistemic notion. Labeling theory-reduction as ‘representational’ rather than ‘epistemic’ leaves open the possibility that the concept of theory-reduction is independent of concepts such as knowledge, belief, justification or understanding. At least Nagel’s official definition does not make use of epistemic concepts.