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Single Idea 9357

[filed under theme 5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle ]

Full Idea

The law of excluded middle formulates our decision that whatever is not designated by a certain term shall be designated by its negative. It declares our purpose to make a complete dichotomy of experience, ..which is only our penchant for simplicity.

Gist of Idea

Excluded middle is just our preference for a simplified dichotomy in experience

Source

C.I. Lewis (A Pragmatic Conception of the A Priori [1923], p.365)

Book Ref

Peirce,James,Dewey etc: 'Pragmatism - The Classic Writings', ed/tr. Thayer,H.S. [Hackett 1982], p.365


A Reaction

I find this view quite appealing. 'Look, it's either F or it isn't!' is a dogmatic attitude which irritates a lot of people, and appears to be dispensible. Intuitionists in mathematics dispense with the principle, and vagueness threatens it.


The 7 ideas from 'A Pragmatic Conception of the A Priori'

Excluded middle is just our preference for a simplified dichotomy in experience [Lewis,CI]
There are several logics, none of which will ever derive falsehoods from truth [Lewis,CI]
We have to separate the mathematical from physical phenomena by abstraction [Lewis,CI]
Necessary truths are those we will maintain no matter what [Lewis,CI]
Names represent a uniformity in experience, or they name nothing [Lewis,CI]
Science seeks classification which will discover laws, essences, and predictions [Lewis,CI]
We can maintain a priori principles come what may, but we can also change them [Lewis,CI]