5 ideas
13831 | Logic is based on transitions between sentences [Prawitz] |
13825 | Natural deduction introduction rules may represent 'definitions' of logical connectives [Prawitz] |
13823 | In natural deduction, inferences are atomic steps involving just one logical constant [Prawitz] |
10494 | Several words may label a category; one word can name several categories; some categories lack words [Ellen] |
19376 | A machine is best defined by its final cause, which explains the roles of the parts [Leibniz] |