I was trying to visualize by drawing a curve / figure to get a double point on a curve. As per the Wolfram article, a double point is a point traced out twice as a closed curve is traversed.
Any visualization insights, intuition, figures of a double point would be much helpful.
"8" and "$\infty$". "$" has three.
And the graph of $y^2 = x^3 - 3x+2$ has one at $(1,0)$.
Why not $r = \cos^2(\theta)$ in polar coordinates?