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Commens
Digital Companion to C. S. Peirce
‘Deduction’ (pub. 02.02.13-10:34). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/entry/quote-harvard-lectures-pragmatism-lecture-v-2.
Term: 
Deduction
Quote: 

These three kinds of reasoning are Abduction, Induction, and Deduction. Deduction is the only necessary reasoning. It is the reasoning of mathematics. It starts from a hypothesis, the truth or falsity of which has nothing to do with the reasoning; and of course its conclusions are equally ideal. The ordinary use of the doctrine of chances is necessary reasoning, although it is reasoning concerning probabilities.

Source: 
Peirce, C. S. (1903). Harvard Lectures on Pragmatism: Lecture V. MS [R] 312.
References: 
CP 5.145
Date of Quote: 
1903
URL: 

http://www.commens.org/dictionary/entry/quote-harvard-lectures-pragmatism-lecture-v-2