 Finally, Hjortland explores another kind of logical pluralism in defending sub-classical logics from Williamson’s abductive argument that classical logic is the One True Logic (Hjortland 2017, 652–657; Williamson 2017). Consider the claim that the ubiquitous use of classical logic (rather than other weaker logics) in mathematics is a strong point in its favour; if we had to give up classical logic, we might be worried about losing a lot of elegant, simple and otherwise virtuous mathematical theories, and preserving virtuous theories (and letting go of ad hoc and otherwise vicious theories) is what the abductive approach in logic is all about.