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What they hold to be true is certain, not defeasible .
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.
They were not in any way, shape or form defeasible .
Each of these would-be reasons is defeasible and has been more than adequately seen off in argument during recent weeks.
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.
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