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Ideas for 'fragments/reports', 'A Tour through Mathematical Logic' and 'Guidebook to Wittgenstein's Tractatus'

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

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A 'tautology' must include connectives [Wolf,RS]

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / c. Derivation rules of PL

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Deduction Theorem: T∪{P}|-Q, then T|-(P→Q), which justifies Conditional Proof [Wolf,RS]