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Ideas for 'works', 'Symbolic Reasoning' and 'fragments/reports'

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2 ideas

4. Formal Logic / A. Syllogistic Logic / 2. Syllogistic Logic

20778

Stoics like syllogisms, for showing what is demonstrative, which corrects opinions [Stoic school, by Diog. Laertius]

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]