Combining Texts

All the ideas for 'Set Theory and related topics (2nd ed)', 'Elements of Mathematical Logic' and 'Basic Problems of Phenomenology'

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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]

4. Formal Logic / F. Set Theory ST / 3. Types of Set / e. Equivalence classes

8920	Equivalence relations are reflexive, symmetric and transitive, and classify similar objects [Lipschutz]

5. Theory of Logic / C. Ontology of Logic / 2. Platonism in Logic

15571

The idea of an atemporal realm of validity is as implausible as medieval theology [Heidegger]

23. Ethics / F. Existentialism / 6. Authentic Self

15581

Dasein is always only that which it has chosen to be [Heidegger]