Defeaters play a central role in modern developments of defeasible reasoning.
This memory undermines the reliability of the perception of the clear sky on which the belief was based.
But at the same time it doesn't give evidential support to the opposite belief that it is raining.
[4] Defeaters play a central role in modern developments of defeasible reasoning.
A defeasible argument, on the other hand, allows the retraction of its conclusion as new evidence is acquired without denying the truth of its premises.