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| 2279 | A triangle has a separate non-invented nature, shown by my ability to prove facts about it [Descartes] |
| Full Idea: A triangle has a determinate nature, which I did not fabricate, and which does not depend on my mind. This is evident from the fact that various properties can be demonstrated regarding it, such as that its three angles are equal to two right angles. | |
| From: René Descartes (Meditations [1641], §5.64) |