In general, this refers to something that can be linked back to Rene Descartes, the French scientist, famous for uttering the phrase, “I think, therefore I am.”

There are several scientific, mathematical, and philosophical branches that are named for Descartes:

In fact, there is an entire philosophic and scientific systems called Cartesianism.

Why I Looked It Up

I was reading something that mentioned “Cartesian” and “Descartes” in the same sentence, and I suddenly connected the two. I had mainly known the phrase “Cartesian coordinates.”

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