display all the ideas for this combination of texts
4 ideas
9429 | Many forms of reasoning, such as extrapolation and analogy, are useful but deductively invalid [Mumford] |
6937 | Reason aims to discover the unknown by thinking about the known [Peirce] |
19444 | Each proposition has an antithesis, and truth exists as its refutation [Feuerbach] |
19445 | A dialectician has to be his own opponent [Feuerbach] |