Combining Texts

Ideas for 'Nature and Observability of Causal Relations', 'What is the Source of Knowledge of Modal Truths?' and 'What are Sets and What are they For?'

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5 ideas

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

14239

The empty set is usually derived from Separation, but it also seems to need Infinity [Oliver/Smiley]

14240

The empty set is something, not nothing! [Oliver/Smiley]

14241

We don't need the empty set to express non-existence, as there are other ways to do that [Oliver/Smiley]

14242

Maybe we can treat the empty set symbol as just meaning an empty term [Oliver/Smiley]

4. Formal Logic / F. Set Theory ST / 3. Types of Set / c. Unit (Singleton) Sets

14243

The unit set may be needed to express intersections that leave a single member [Oliver/Smiley]