1974 | On the General Idea of Proof Theory |
§1 | p.215 | 13826 | Model theory looks at valid sentences and consequence, but not how we know these things |
§2 | p.217 | 13827 | Logical consequence isn't a black box (Tarski's approach); we should explain how arguments work |
1974 | Gentzen's Analysis of First-Order Proofs |
§04 | p.230 | 13831 | Logic is based on transitions between sentences |
1.1 | p.202 | 13823 | In natural deduction, inferences are atomic steps involving just one logical constant |
2.2.2 | p.210 | 13825 | Natural deduction introduction rules may represent 'definitions' of logical connectives |