13831 | Logic is based on transitions between sentences |
13827 | Logical consequence isn't a black box (Tarski's approach); we should explain how arguments work |
13825 | Natural deduction introduction rules may represent 'definitions' of logical connectives |
13823 | In natural deduction, inferences are atomic steps involving just one logical constant |
13826 | Model theory looks at valid sentences and consequence, but not how we know these things |