4 ideas
15990 | Every individual thing which exists has an essence, which is its internal constitution [Locke] |
15994 | If it is knowledge, it is certain; if it isn't certain, it isn't knowledge [Locke] |
18284 | Particulars can be verified or falsified, but general statements can only be falsified (conclusively) [Popper] |
19087 | The meaning or purport of a symbol is all the rational conduct it would lead to [Peirce] |