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Single Idea 18807

[filed under theme 5. Theory of Logic / K. Features of Logics / 10. Monotonicity ]

Full Idea

Monotonicity seems to mark the difference between cases in which a guarantee obtains and those where the premises merely provide inductive support for a conclusion.

Gist of Idea

Monotonicity means there is a guarantee, rather than mere inductive support

Source

Ian Rumfitt (The Boundary Stones of Thought [2015], 2.3)

Book Ref

Rumfitt,Ian: 'The Boundary Stones of Thought' [OUP 2015], p.43


A Reaction

Hence it is plausible to claim that 'non-monotonic logic' is a contradiction in terms.


The 6 ideas with the same theme [if something is proved, nothing new can unprove it]:

Valid deduction is monotonic - that is, it remains valid if further premises are added [Psillos]
Explanations fail to be monotonic [Rosen]
Most deductive logic (unlike ordinary reasoning) is 'monotonic' - we don't retract after new givens [Wolf,RS]
In classical logic the relation |= has Monotony built into its definition [Antonelli]
Cautious Monotony ignores proved additions; Rational Monotony fails if the addition's negation is proved [Antonelli]
Monotonicity means there is a guarantee, rather than mere inductive support [Rumfitt]