Combining Texts

All the ideas for 'Autobiography', 'An Introduction to Modal Logic' and 'Philosophical Implications of Mathematical logic'

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7 ideas

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / b. Terminology of PL

9540	A 'value-assignment' (V) is when to each variable in the set V assigns either the value 1 or the value 0 [Hughes/Cresswell]

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / d. Basic theorems of PL

9541	The Law of Transposition says (P→Q) → (¬Q→¬P) [Hughes/Cresswell]

4. Formal Logic / B. Propositional Logic PL / 4. Soundness of PL

9543	The rules preserve validity from the axioms, so no thesis negates any other thesis [Hughes/Cresswell]

5. Theory of Logic / C. Ontology of Logic / 1. Ontology of Logic

22329

Logic is highly general truths abstracted from reality [Russell, by Glock]

5. Theory of Logic / K. Features of Logics / 4. Completeness

9544	A system is 'weakly' complete if all wffs are derivable, and 'strongly' if theses are maximised [Hughes/Cresswell]

15. Nature of Minds / C. Capacities of Minds / 5. Generalisation by mind

21569

It is good to generalise truths as much as possible [Russell]

22. Metaethics / C. The Good / 2. Happiness / d. Routes to happiness

7076	Mill wondered if he would be happy if all his aims were realised, and answered no [Mill, by Critchley]