at all functions
| of propositions which appear are
| truth-functions.  The extreme of
| the extensional point of view does
| away with propositions altogether and
| retains only truth-values in their place.
|
| Alonzo Church, in Runes, pages 147-148.
|
| Dagobert Runes (ed.), 'Dictionary of Philosophy',
| Littlefield, Adams, &amp; Company, Totowa, NJ, 1972.

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