 For example, a theory might result in an infinite regress of entities and so entail that there are infinitely many things. This in itself is, arguably, not objectionable. But it might be a local vice to a theory if we have independent reason to think that we are dealing with a finite domain. (See Nolan 2001, 531–532, and Nolan 2019.) (Some philosophers object to the very idea of reality containing infinities. Aristotle, e.g., famously allowed that there could be potential infinite series, but not completed infinite series. (See Mendel 2017.)) But we will ignore such general anti-infinitism in this entry, for it is infinity itself that such theorists take to be objectionable, not infinite regresses per se.)