Combining Texts

All the ideas for 'Necessary Existents', 'Gentzen's Analysis of First-Order Proofs' and 'Summa Contra Gentiles'

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

---

7 ideas

1. Philosophy / A. Wisdom / 2. Wise People

22115

Wise people should contemplate and discuss the truth, and fight against falsehood [Aquinas]

5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic

13831

Logic is based on transitions between sentences [Prawitz]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

13825

Natural deduction introduction rules may represent 'definitions' of logical connectives [Prawitz]

5. Theory of Logic / H. Proof Systems / 4. Natural Deduction

13823

In natural deduction, inferences are atomic steps involving just one logical constant [Prawitz]

17. Mind and Body / A. Mind-Body Dualism / 4. Occasionalism

20700

Without God's influence every operation would stop, so God causes everything [Aquinas]

19. Language / D. Propositions / 3. Concrete Propositions

19216

Propositions (such as 'that dog is barking') only exist if their items exist [Williamson]

27. Natural Reality / D. Time / 1. Nature of Time / f. Eternalism

15202

Eternity coexists with passing time, as the centre of a circle coexists with its circumference [Aquinas]