Ideas from 'An Analysis of Knowledge and Valuation' by C.I. Lewis [1946], by Theme Structure

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13. Knowledge Criteria / B. Internal Justification / 4. Foundationalism / a. Foundationalism
If anything is to be probable, then something must be certain
18. Thought / C. Content / 8. Intension
Extension is the class of things, intension is the correct definition of the thing, and intension determines extension