Combining Texts

All the ideas for '75: Is 'Live Unknown' a Wise Precept?', 'Free Will Defence' and 'works'

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8 ideas

5. Theory of Logic / A. Overview of Logic / 2. History of Logic

11022

Gentzen introduced a natural deduction calculus (NK) in 1934 [Gentzen, by Read]

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

11065

The inferential role of a logical constant constitutes its meaning [Gentzen, by Hanna]

11023

The logical connectives are 'defined' by their introduction rules [Gentzen]

11213

Each logical symbol has an 'introduction' rule to define it, and hence an 'elimination' rule [Gentzen]

6. Mathematics / B. Foundations for Mathematics / 4. Axioms for Number / g. Incompleteness of Arithmetic

10067

Gentzen proved the consistency of arithmetic from assumptions beyond arithmetic [Gentzen, by Musgrave]

15. Nature of Minds / A. Nature of Mind / 2. Psuche

5959	Some philosophers say the soul is light [Plutarch]

29. Religion / D. Religious Issues / 3. Problem of Evil / b. Human Evil

1474	Moral evil may be acceptable to God because it allows free will (even though we don't see why this is necessary) [Plantinga, by PG]

29. Religion / D. Religious Issues / 3. Problem of Evil / d. Natural Evil

1475	It is logically possible that natural evil like earthquakes is caused by Satan [Plantinga, by PG]