Principle of nonvacuous contrast

The principle of nonvacuous contrast is a logical or methodological principle which requires that a genuine predicate never refer to everything, or to nothing, within its universe of discourse. The implications of this is that for a predicate to be meaningful it can neither apply to all members of a group or to no members of the group.

References

  • William Dray (1964). Philosophy of History. Englewood Cliffs, NJ: Prentice-Hall, Inc. pp. 29 pp.


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