Logic Deductive and Inductive by Carveth Read

Author:Carveth Read [Read, Carveth]
Language: eng
Format: epub
Published: 2006-05-23T04:00:00+00:00

§ 3. The Canon of Difference.

If an instance in which a phenomenon occurs, and an instance in which it does not occur, have every other circumstance in common save one, that one (whether consequent or antecedent) occurring only in the former; the circumstance in which alone the two instances differ is the effect, or the cause, or an indispensable condition of the phenomenon.

This follows from Props. I (a) and (b), in chapter xv. § 7. To prove that A is a condition of p, let two instances, such as the Canon requires, be represented thus:

A B C B C

p q r q r

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