  Controversy concerning Pythagoras’ role as a scientist and mathematician will continue. Indeed, Hahn has recently endorsed many of Zhmud’s arguments and argues that Pythagoras was a rational cosmologist, who was further developing a project begun by Thales to contruct the cosmos out of right triangles. Hahn admits, however, that his thesis is “speculative” and “a circumstantial case at best” (2017:xi). It should now be clear that decisions about sources are crucial in addressing the question of whether Pythagoras was a mathematician and scientist. The view of Pythagoras’ cosmos sketched in the first five paragraphs of this section, according to which he was neither a mathematician nor a scientist, remains the consensus. 