Defeasability

Definition:

In logic and philosophy, defeasability refers to the quality of a statement or argument that allows it to be rendered false or invalid by the emergence of new information, evidence, or circumstances.

Characteristics of Defeasability

1. Conditional Nature:

Defeasibility is inherently conditional, meaning that the truth or validity of a statement or argument is provisional and subject to revision based on counteracting evidence or circumstances.

2. Rebuttable Reasoning:

Defeasibility is closely related to rebuttal in reasoning. A defeasible argument can be challenged or defeated by providing evidence or arguments that disprove its initial validity.

3. Contextual Reliance:

Defeasibility depends on the contextual factors involved. The truth or validity of a statement may change based on the specific circumstances, timeframe, or additional information available.

4. Non-Monotonic Reasoning:

Defeasibility often requires non-monotonic reasoning, which entails the ability to reason with incomplete or uncertain information, allowing for defeasible statements to be revised or negated.

5. Fallible Nature:

Due to its potential for revision, defeasibility acknowledges the possibility of human fallibility. It recognizes that initial beliefs or arguments may be proven wrong and encourages critical thinking and openness to change.