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Each step sets Q := P + Q, where Q is initally ∞. Points on the curve are green, P and Q are blue, the straight line through P and Q are small blue dots, the third point of intersection is yellow, and the sum P + Q is red.
Each step sets Q := P + Q, where Q is initally ∞. Points on the curve are green, P and Q are blue, the straight line through P and Q are small blue dots, the third point of intersection is yellow, and the sum P + Q is red.