Jerry R.: Setting aside whether it is proper to classify the formulation in CP 5.189 as a syllogism--Peirce defined a "conditional syllogism" in CP 2.571 as "a syllogism containing a conditional premiss, especially the Modus Ponens and Modus Tollens, although some logicians refuse to these arguments the name of syllogism"--B has nothing to do with surprise/suspect. In fact, as I pointed out to you off-list, it turns out that there is no "missing B" in either CP 2.718 or CP 5.189 at all; Peirce quite deliberately used A and C, as many logic textbooks still do today, simply because they stand for Antecedent and Consequent.
Regards, Jon Alan Schmidt - Olathe, Kansas, USA Professional Engineer, Amateur Philosopher, Lutheran Layman www.LinkedIn.com/in/JonAlanSchmidt - twitter.com/JonAlanSchmidt On Fri, May 13, 2016 at 1:32 PM, Jerry Rhee <jerryr...@gmail.com> wrote: > Hi everyone, > > Jon S. sent me this first reference: > > *Modus Ponens (CP 2.718):* > > *Rule. *If *A *is true, *C *is true, > > *Case. *In a certain case *A *is true; > > *Result. *.ยท. In that case *C *is true. > > > Compare against: > > > *Syllogism:* > > *Result. *The surprising fact C is observed. > > *Rule. *But if A were true, C would be a matter of course. > > *Case. *Hence, there is reason to suspect A is true. > > > CP 5.189 would only conform as syllogism if surprise/suspect = B. > > > So, is surprise/suspect = B surprising? > > Is it suspicious? > > Was your feeling internal/external, etc.? > > > Is surprise/suspect *necessary*? > > For what is it necessary? > > That is, what is it *good* for when you could have CP 2.718 and end up > with the same thing? > > > Hth, > > Jerry R >
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