curve node | simple double point

An ordinary double point of a plane curve is point where a curve intersects itself such that two branches of the curve have distinct tangent lines. Ordinary double points of plane curves are commonly known as crunodes. Ordinary double points of a plane curves given by f(x, y) = 0 satisfy f = f_x = f_y = 0, where f_x denotes a partial derivative.

algebraic surface | Barth decic | Barth sextic | Cayley cubic | Chmutov surface | cusp | dervish | double point | Endraß octic | isolated singularity | Kummer surface | rational double point | Sarti dodecic