| Since this was in fact the case, the appellant submitted that the defeasibility of the vested property did not deprive the gift of its absolute character. |
| Given the non-monotonicity and the defeasibility of this pattern of practical reasoning, the inferences corresponding to it can be evaluated using critical questions. |
| But prima facie permanence of obligations does, like all prima facie statements imply defeasibility. |
| However, this is just the inevitable defeasibility of any form of inference that depends on background empirical presuppositions. |
| The third feature of rational reasons is their defeasibility. |
| See also Makinson 1993 for a sweeping discussion of defeasibility and the place of deontic conditionals in this context. |
