Combining Texts

Ideas for 'The Philosophy of Logical Atomism', 'Dialogues Concerning Natural Religion' and 'Intro: Theories of Vagueness'

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2 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

9065	S5 collapses iterated modalities (◊□P→□P, and ◊◊P→◊P) [Keefe/Smith]

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

6103	Normally a class with only one member is a problem, because the class and the member are identical [Russell]