Function points {acnode} {isolated point} can have no nearby points that belong to function. Acnodes must be at least double points.
Points {centroid, curve} can be curve-point-coordinate arithmetic means.
Curve branches meet at a point {multiple point}.
Two curve branches can meet at point {node, curve} {double point}. Both branches can have real and distinct tangents {crunode}. Both branches can have real and coincident tangents {cusp, curve}. Both branches can have imaginary tangents at acnodes.
Curves can have double cusps {tacnode} {point of osculation} {osculation point}.
Turning points or maximum or minimum points {stationary point} do not have to be inflection points.
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Date Modified: 2022.0225