4 ideas
8920 | Equivalence relations are reflexive, symmetric and transitive, and classify similar objects [Lipschutz] |
13639 | Quine says higher-order items are intensional, and lack a clearly defined identity relation [Quine, by Shapiro] |
21557 | Russell confused use and mention, and reduced classes to properties, not to language [Quine, by Lackey] |
20328 | A thing is only seen as art in an 'artworld', which has a theory and a history [Danto] |