Combining Texts

All the ideas for 'Letters to Edward Stillingfleet', 'Elements of Mathematical Logic' and 'Prcis of 'Ruling Passions''

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4 ideas

4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic

8942	Lukasiewicz's L3 logic has three truth-values, T, F and I (for 'indeterminate') [Lukasiewicz, by Fisher]

9. Objects / D. Essence of Objects / 3. Individual Essences

15990

Every individual thing which exists has an essence, which is its internal constitution [Locke]

11. Knowledge Aims / B. Certain Knowledge / 1. Certainty

15994

If it is knowledge, it is certain; if it isn't certain, it isn't knowledge [Locke]

22. Metaethics / A. Ethics Foundations / 1. Nature of Ethics / d. Ethical theory

11911

Some philosophers always want more from morality; for others, nature is enough [Blackburn]