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René Descartes (French philosopher, mathematician and statistician) presented his "Cartesian coordinates" using just nonnegative numbers.
4. Mind
It is not enough to have a good mind; the main thing is to use it well.René Descartes (French philosopher, mathematician and statistician)
5. Divide and conquer
Divide each difficulty into as many parts as is feasible and necessary to resolve itRené Descartes (French philosopher, mathematician and statistician)
6. Thinking
I think; therefore I am.René Descartes (French philosopher, mathematician and statistician)
7. Deception
The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.René Descartes (French philosopher, mathematician and statistician)
8. Proofs
The first precept was never to accept a thing as true until I knew it as such without a single doubt.René Descartes (French philosopher, mathematician and statistician)
9. Truth
If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.René Descartes (French philosopher, mathematician and statistician)
10. Optimism
An optimist may see a light where there is none, but why must the pessimist always run to blow it out?René Descartes (French philosopher, mathematician and statistician)
