Are there really principles of logic that aren't demonstrable? If we can demonstrate situations where principles are required for logical outcomes to apply, then doesn't it show that one has just demonstrated that a given principle is so? I realize that in light of the view that induction fails because the future can always disprove a concept (especially given that we are not infallible and that premises that seem so obvious now, may later prove to be wrong), a principle is so because it is demonstrable in the here and now (and may never be proven wrong). Reading RPG A MP Politis Ch 5, Sec. 3.
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