Combining Texts

All the ideas for 'Symbolic Reasoning', 'Is Justified True Belief Knowledge?' and 'Barcan Formulae'

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3 ideas

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

15380

Barcan:nothing comes into existence; Converse:nothing goes out; Both:domain is unchanging [Vervloesem]

4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set

21548

The null class is the class with all the non-existents as its members [MacColl, by Lackey]

13. Knowledge Criteria / A. Justification Problems / 2. Justification Challenges / b. Gettier problem

8886	Being a true justified belief is not a sufficient condition for knowledge [Gettier]