Hello friends,

This is General Knowledge Quiz Contest - 67.

Test your General Knowledge participating by giving answer in comment.

Question:

René Descartes (1596-1650), whose philosophical writing is seminal to much of Western philosophy also developed what seminal mathematical concept?

Options:

A
A square whose sides are 1 unit long has a diagonal whose length cannot be rational
B
In a right-angled triangle, the hypotenuse squared equals the squares of the other two sides added
C
The use of algebra to describe geometry
D
Every polynomial equation over the field of complex numbers higher than 1 has a complex solution

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