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:
  1. (1)

    Light travels faster than sound.

  2. (2)

    Large doses of vitamin C protect against the common cold and influenza.

  3. (3)

    Olof Palme will be the prime minister of Sweden in 1980.

  4. (4)

    David Hume was 5′ 6″tall.



Modal Logic Inductive Logic Conjunction Condition Positive Degree Vague Concept 
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  1. 1.
    The expression “specification” is used in this sense by Kit Fine in “Vagueness, Truth, and Logic,” Synthese 30 (1975), pp. 265–300 (p. 268)CrossRefGoogle Scholar
  2. 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

Copyright information

© Martinus Nijhoff Publishers, The Hague/Boston/London 1980

Authors and Affiliations

  • Risto Hilpinen
    • 1
  1. 1.University of TurkuFinland

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