Full Idea
There is notoriously a problem about what to say concerning mathematical sentences within the possible-worlds framework.
Gist of Idea
Mathematical sentences are a problem in a possible-worlds framework
Source
Frank Jackson (From Metaphysics to Ethics [1998], Ch.3 n25)
Book Reference
Jackson,Frank: 'From Metaphysics to Ethics' [OUP 2000], p.71
A Reaction
Presumably this concerns possible axioms and their combinations.