Part of the International Institute of Philosophy Symposium in Düsseldorf / Institut International de Philosophie Entretiens de Düsseldorf book series (IIPH, volume 5)
Some Epistemological Interpretations of Modal Logic
Our beliefs are vague in (at least) two ways: the propositions believed are vague (contain vague concepts), and the boundary between belief and unbelief is vague, that is, the concept of belief itself is vague. Vagueness of the latter type is illustrated by the following sentences:
Light travels faster than sound.
Large doses of vitamin C protect against the common cold and influenza.
Olof Palme will be the prime minister of Sweden in 1980.
David Hume was 5′ 6″tall.
KeywordsModal Logic Inductive Logic Conjunction Condition Positive Degree Vague Concept
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- 2.See G.L.S. Shackle, Expectation in Economics, Cambridge University Press, Cambridge 1952, and Decision, Order and Time, Cambridge University Press, Cambridge 1961,Google Scholar
© Martinus Nijhoff Publishers, The Hague/Boston/London 1980