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3 ideas
14502 | Plato's idea of 'structure' tends to be mathematically expressed [Plato, by Koslicki] |
14430 | If a relation is symmetrical and transitive, it has to be reflexive [Russell] |
14432 | 'Asymmetry' is incompatible with its converse; a is husband of b, so b can't be husband of a [Russell] |