Ideas from 'A Pragmatic Conception of the A Priori' by C.I. Lewis [1923], by Theme Structure
[found in 'Pragmatism - The Classic Writings' by Peirce,James,Dewey etc (ed/tr Thayer,H.S.) [Hackett 1982,0-915145-37-5]].
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5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
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There are several logics, none of which will ever derive falsehoods from truth
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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Excluded middle is just our preference for a simplified dichotomy in experience
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5. Theory of Logic / F. Referring in Logic / 1. Naming / a. Names
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Names represent a uniformity in experience, or they name nothing
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10. Modality / A. Necessity / 11. Denial of Necessity
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Necessary truths are those we will maintain no matter what
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12. Knowledge Sources / A. A Priori Knowledge / 7. A Priori from Convention
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We can maintain a priori principles come what may, but we can also change them
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18. Thought / E. Abstraction / 2. Abstracta by Selection
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We have to separate the mathematical from physical phenomena by abstraction
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26. Natural Theory / D. Laws of Nature / 8. Scientific Essentialism / a. Scientific essentialism
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Science seeks classification which will discover laws, essences, and predictions
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