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" "it appears to me that I have discovered many truths more useful and more important than all I had before learned, or even had expected to learn.
René Descartes (March 31, 1596 – February 11, 1650) was a highly influential French philosopher, mathematician, physicist and writer. He is known for his influential arguments for substance dualism, where mind and body are considered to have distinct essences, one being characterized by thought, the other by spatial extension. He has been dubbed the "Father of Modern Philosophy" and the "Father of Modern Mathematics." He is also known as Cartesius.
Biography information from Wikiquote
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Zira bilimlerin hepsi insan bilgeliğinden (humana sapientia) başka bir şey değildir ve nasıl ki şeylerin çeşit çeşit olması, onları aydınlatan güneşin doğasında bir fark yaratmıyorsa, akıl da ne kadar farklı konuyla ilgilenirse ilgilensin hep bir ve aynı kalır. Dolayısıyla insan aklının herhangi bir sınırlamaya ihtiyacı yoktur. Bir doğrunun bilinmesi, bir sanatı edinmenin bir diğerini edinmeyi engellemesi gibi değildir; başka bir doğrunun bilinmesine engel olmasının aksine bu konuda bize yardımcı bile olur.
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Thus, all unknown quantities can be expressed in terms of a single quantity, whenever the problem can be constructed by means of circles and straight lines, or by conic sections, or even by some other curve of degree not greater than the third or fourth.
But I shall not stop to explain this in more detail, because I should deprive you of the pleasure of mastering it yourself, as well as of the advantage of training your mind by working over it, which is in my opinion the principal benefit to be derived from this science. Because, I find nothing here so difficult that it cannot be worked out by anyone at all familiar with ordinary geometry and with algebra, who will consider carefully all that is set forth in this treatise.