 This argument invokes a compelling pattern of inference (one that is perhaps lurking in the background of the Classical Incompatibilist Argument) regarding claims about what is power necessary for a person. Power necessity, as applied to true propositions (or facts), concerns what is not within a person’s power. Or, put differently, it concerns facts that a person does not have power over. To say that a person does not have power over a fact is to say that she cannot act in such a way that the fact would not obtain. To illustrate, no person has power over the truths of mathematics. That is, no person can act in such a way that the truths of mathematics would be false. Hence, the truths of mathematics are, for any person, power necessities.