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Ideas of C.I. Lewis, by Text

[American, 1883 - 1964, Born at Stoneham. Professor at Harvard University.]

1923 A Pragmatic Conception of the A Priori
p.365 p.365 Excluded middle is just our preference for a simplified dichotomy in experience
p.366 p.366 There are several logics, none of which will ever derive falsehoods from truth
p.367 p.367 Necessary truths are those we will maintain no matter what
p.367 p.367 We have to separate the mathematical from physical phenomena by abstraction
p.368 p.368 Science seeks classification which will discover laws, essences, and predictions
p.368 p.368 Names represent a uniformity in experience, or they name nothing
p.373 p.373 We can maintain a priori principles come what may, but we can also change them
1932 Symbolic Logic (with Langford)
p.180 Modal logic began with translation difficulties for 'If...then' [Girle]
1935 works
p.13 The simplest of the logics based on possible worlds is Lewis's S5 [Girle]
p.118 Equating necessity with informal provability is the S4 conception of necessity [Read]
1946 An Analysis of Knowledge and Valuation
p.17 Extension is the class of things, intension is the correct definition of the thing, and intension determines extension
186 p.6 If anything is to be probable, then something must be certain
1946 An Analysis of Knowledge and Valuation
334 p.35 We rely on memory for empirical beliefs because they mutually support one another
338 p.13 Congruents assertions increase the probability of each individual assertion in the set
358 p.50 If we doubt memories we cannot assess our doubt, or what is being doubted