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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 9357 Excluded middle is just our preference for a simplified dichotomy in experience
p.366 p.366 9358 There are several logics, none of which will ever derive falsehoods from truth
p.367 p.367 9362 Necessary truths are those we will maintain no matter what
p.367 p.367 9361 We have to separate the mathematical from physical phenomena by abstraction
p.368 p.368 9363 Science seeks classification which will discover laws, essences, and predictions
p.368 p.368 9364 Names represent a uniformity in experience, or they name nothing
p.373 p.373 9365 We can maintain a priori principles come what may, but we can also change them
1932 Symbolic Logic (with Langford)
p.180 7803 Modal logic began with translation difficulties for 'If...then' [Girle]
1935 works
p.13 7791 The simplest of the logics based on possible worlds is Lewis's S5 [Girle]
p.118 11002 Equating necessity with informal provability is the S4 conception of necessity [Read]
1946 An Analysis of Knowledge and Valuation
p.17 5828 Extension is the class of things, intension is the correct definition of the thing, and intension determines extension
186 p.6 6556 If anything is to be probable, then something must be certain
334 p.35 21500 We rely on memory for empirical beliefs because they mutually support one another
338 p.13 21498 Congruents assertions increase the probability of each individual assertion in the set
358 p.50 21501 If we doubt memories we cannot assess our doubt, or what is being doubted