Jerry R., List: Thank you for laying this out so clearly. I still have to disagree, for several reasons.
- A and C are not terms (subject/predicate/middle), they are propositions. - Peirce uses the rule/case/result formulations for syllogisms in predicate logic; does he ever do so for propositional logic? - "A is C" is not logically equivalent to "if A then C"; likewise for the other "translations." - Surprise and suspicion are not terms of the argument itself, they are effects on a person--which is what seems to interest you about them. - Surprise and suspicion are not identical terms, which they would have to be in order to get (deductively) from "C is A" and "A is suspicious" to "C is surprising." Regards, Jon Alan Schmidt - Olathe, Kansas, USA Professional Engineer, Amateur Philosopher, Lutheran Layman www.LinkedIn.com/in/JonAlanSchmidt - twitter.com/JonAlanSchmidt On Mon, Apr 25, 2016 at 6:18 PM, Jerry Rhee <[email protected]> wrote: > My argument and accounts are the following: > > > > CP 5.189 is a syllogism, that is, they share identity because: > > > > Given B = surprise or suspect: > > > > Conversion to deductive form of categorical syllogism (which requires > three terms and distributed constraints): > > > > *Abductive form* > > The surprising fact, C, is observed; > Result > > But if A were true, C would be a matter of course, Rule > > Hence, there is reason to suspect that A is true'. Case > > > > *Deductive form* > > But if A were true, C would be a matter of course, Rule > > Hence, there is reason to suspect that A is true'. Case > > The surprising fact, C, is observed; > Result > > > > *Substitution gives:* > > > > A is C Rule > > B is A Case > > B is C Result > > > > Subject B > > Predicate C > > Middle A > > > > Major premise: A is C Rule if A were true, C matter of > course > > Minor premise: B is A Case Hence, there is reason to suspect > that A is true. > > Conclusion: B is C Result The surprising fact, C, is > observed; > > *Inversion gives:* > > > > C is A Rule A is C or > *C is A* > > A is B Case Suspicious is A or *A > is suspicious* > > C is B Result Surprising is C or > *C is surprising* > > > > Subject: C > > Predicate B > > Middle A > > > > Major premise: B is A Case Hence, there is reason to suspect > that A is true'. Minor premise: A is C Rule But if A were > true, C a matter of course. Conclusion: C is B Result The > surprising fact, C, is observed; >
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