Rene Descartes invented the famous Cartesian coordinate
system.He worked in the field of analytic geometry.
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Rene desscartes was the father of mathematics.
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== == Oddly enough, the place now called Descartes. Initially called La Haye en Touraine, the town was renamed La Haye-Descartes in 1802 in his honour, and then renamed again to Descartes in 1967.
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Short answer: Descartes' doubt was like WWI - the doubt to end
all doubt. Only by doubting everything could Descartes hope to find
anything that was certain (even if the only certainty is that
nothing else is certain!).
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Some math mathematicians say that Descartes inspiration came
from being in bed so late. But, this also came about because of his
love for math and all of his studying.