Combining Texts

All the ideas for 'Exigency to Exist in Essences', 'Tarski on Truth and Logical Consequence' and 'Investigations into Logical Deduction'

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6 ideas

3. Truth / F. Semantic Truth / 1. Tarski's Truth / c. Meta-language for truth

19323

'Snow is white' depends on meaning; whether snow is white depends on snow [Etchemendy]

3. Truth / G. Axiomatic Truth / 1. Axiomatic Truth

19137

We can get a substantive account of Tarski's truth by adding primitive 'true' to the object language [Etchemendy]

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

13832

Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking]

7. Existence / A. Nature of Existence / 5. Reason for Existence

19400

Possibles demand existence, so as many of them as possible must actually exist [Leibniz]

19401

God's sufficient reason for choosing reality is in the fitness or perfection of possibilities [Leibniz]

10. Modality / E. Possible worlds / 1. Possible Worlds / a. Possible worlds

19402

The actual universe is the richest composite of what is possible [Leibniz]