 In contrast to Yablo, Leng (2005a, 2010), Daly (2006), and Balaguer (2009) respond to Burgess’s argument by defending revolutionary fictionalism. Leng’s version of the response is based on the claim that it is acceptable for philosophers to evaluate and criticize the work of mathematicians. Of course, Leng acknowledges that mathematics is a very successful practice and that philosophers have to respect this, but her claim is that we can account for the success of mathematics without supposing that it’s true. And given this, she argues, we can rationally evaluate and criticize mathematical practice from the outside, from a philosophical point of view.