Question

What is non monotonic reasoning in AI?

Answer 1

A logic is non-monotonic if some conclusions can be invalidated by adding more knowledge.

Non-monotonic reasoning is useful for representing defaults. A default is a rule that can be used unless it overridden by an exception.

Answer 2

A logic is non-monotonic if some conclusions can be invalidated by adding more knowledge. ... Non-monotonic reasoning is useful for representing defaults. A default is a rule that can be used unless it overridden by an exception.