Plane Cubic Curves

A conic section is a plane quadratic curve, that is, the graph of an equation of the form , for given coefficients . The possible curves are a circle, an ellipse, a parabola, or a hyperbola, with degenerate cases two straight lines (parallel or intersecting), a single straight line, a point, or the empty set.
A plane cubic curve is the graph of an equation of the form , for given coefficients . Cubics offer a far greater number of forms. There can be cusps, self intersections, an isolated point, a separate oval, and many combinations of straight, conic, or cubic asymptotes.



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The three snapshots are taken from the 45 interesting examples at Steven J. Wilson's A Gallery of Cubic Plane Curves.


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