Combining Texts

All the ideas for 'Set Theory and related topics (2nd ed)', 'Practical Necessity' and 'fragments/reports'

expand these ideas     |    start again     |     specify just one area for these texts

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3 ideas

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]

10. Modality / A. Necessity / 8. Transcendental Necessity

490	Everything happens by reason and necessity [Leucippus]

10. Modality / A. Necessity / 10. Impossibility

23283

Necessity implies possibility, but in experience it matters which comes first [Williams,B]