(1) A second element of positive analogy between these two presumptions is that both are defeasible ; and that they are, consequently, not to be identified with assumptions.(2) What they hold to be true is certain, not defeasible .(3) Each of these would-be reasons is defeasible and has been more than adequately seen off in argument during recent weeks.(4) They were not in any way, shape or form defeasible .(5) In the jargon, this means that any scientific claim is defeasible , meaning it is in principle open to revision or rejection in the light of further disclosures, arguments, or evidence.(6) However, this is just the inevitable defeasibility of any form of inference that depends on background empirical presuppositions.(7) In the MMR case, however, people do not want to hear about defeasibility and inductive probability.(8) Most of the work in rational cognition is carried out by epistemic cognition, and must be done defeasibly .(9) This technical report describes the construction of an experimental planner that finds plans by reasoning about them defeasibly rather than by running a search algorithm.(10) The third feature of rational reasons is their defeasibility .
