Tyrrell_McAllister comments on No Universally Compelling Arguments in Math or Science - Less Wrong
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"Sufficiently sane/intelligent" means something like, "Has a sufficient tendency to form true inferences from a sufficiently wide variety of bodies of evidences."
Now, we believe that modus ponens yields true inferences. We also believe that a tendency to make inferences contrary to modus ponens will cause a tendency to make false inferences. From this you can infer that we believe that a sufficiently sane/intelligent agent will implement modus ponens.
But the truth of this inference about our beliefs does not mean that "sufficiently sane/intelligent" is defined to mean "implements modus ponens".
In particular, our definition of "sufficiently sane/intelligent" implies that, if A is a sufficiently sane/intelligent agent who lives in an impossible possible world that does not implement modus ponens, then A does not implement modus ponens.