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How did Rene Descartes come up the cartesian plane?
Cartesian coordinates are named after French mathematician Rene Descartes, who lived in the early 1600s & developed many modern conventions of mathematical notation.
A French mathematician surnamed Descartes.
Descartes found it impossible to doubt his own existence. The reason for this was that he felt that thoughts had to come from himself.
An infinite number in a Euclidean plane - which is the "normmal" plane. Some selected numbers in the finite or affine planes (but you need to be studying projective geometry to come across these).