17 ideas
| 2661 | Dialectic is speech cast in the form of logical argument [Cicero] |
| 2673 | There cannot be more than one truth [Cicero] |
| 7548 | Classes, grouped by a convenient property, are logical constructions [Russell] |
| 2669 | Dialectic assumes that all statements are either true or false, but self-referential paradoxes are a big problem [Cicero] |
| 7545 | Visible things are physical and external, but only exist when viewed [Russell] |
| 2664 | If we have complete healthy senses, what more could the gods give us? [Cicero] |
| 7549 | If my body literally lost its mind, the object seen when I see a flash would still exist [Russell] |
| 7553 | Sense-data are purely physical [Russell] |
| 2665 | How can there be a memory of what is false? [Cicero] |
| 20800 | Every true presentation can have a false one of the same quality [Cicero] |
| 7546 | A man is a succession of momentary men, bound by continuity and causation [Russell] |
| 7550 | We could probably, in principle, infer minds from brains, and brains from minds [Russell] |
| 17722 | The concept 'red' is tied to what actually individuates red things [Peacocke] |
| 2672 | Virtues must be very detached, to avoid being motivated by pleasure [Cicero] |
| 7551 | Matter is a logical construction [Russell] |
| 7547 | Matter requires a division into time-corpuscles as well as space-corpuscles [Russell] |
| 7552 | Six dimensions are needed for a particular, three within its own space, and three to locate that space [Russell] |