Combining Texts

Ideas for 'The Bhagavad Gita', 'A Pragmatic Conception of the A Priori' and 'Reference and Necessity'

unexpand these ideas     |    start again     |     choose another area for these texts

display all the ideas for this combination of texts

1 idea

5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
9358 There are several logics, none of which will ever derive falsehoods from truth [Lewis,CI]
     Full Idea: The fact is that there are several logics, markedly different, each self-consistent in its own terms and such that whoever, using it, avoids false premises, will never reach a false conclusion.
     From: C.I. Lewis (A Pragmatic Conception of the A Priori [1923], p.366)
     A reaction: As the man who invented modal logic in five different versions, he speaks with some authority. Logicians now debate which version is the best, so how could that be decided? You could avoid false conclusions by never reasoning at all.