4 ideas
9548 | A mathematical object exists if there is no contradiction in its definition [Waterfield] |
17619 | We renounce all abstract entities [Goodman/Quine] |
2614 | Modern phenomenalism holds that objects are logical constructions out of sense-data [Ayer] |
2615 | The concept of sense-data allows us to discuss appearances without worrying about reality [Ayer] |