Combining Texts

All the ideas for 'Set Theory and related topics (2nd ed)', 'reports' and 'The Approach to Metaphysics'

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

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3 ideas

1. Philosophy / E. Nature of Metaphysics / 4. Metaphysics as Science

14799

Metaphysics rests on observations, but ones so common we hardly notice them [Peirce]

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

3016	Even the gods cannot strive against necessity [Pittacus, by Diog. Laertius]