Descartes' bridge between geometry and algebra: every point in the plane is a pair (x, y) ∈ ℝ², every line is a linear equation, every conic a quadratic form. Foundation of modern analytic geometry.
Descartes' bridge between geometry and algebra: every point in the plane is a pair (x, y) ∈ ℝ², every line is a linear equation, every conic a quadratic form. Foundation of modern analytic geometry.