Curve
Videos
In mathematics, a curve is an object similar to a line, but that does not have to be straight.
Megalithic art from Newgrange showing an early interest in curves
A dragon curve with a positive area
Manifold
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In mathematics, a manifold is a topological space that locally resembles Euclidean space near each point. More precisely, an n -dimensional manifold, or n -manifold for short, is a topological space w
The surface of the Earth requires (at least) two charts to include every point without plotting the same point more than once on the same chart. Here the globe is decomposed into charts around the North and South Poles.