Borromean Rings
The Borromean rings consist of three topological circles which are linked and form a Brunnian link.
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![Isolines of Borromean Rings, Three Circles](geometric-art-borromean-rings-isolines-three-circle-tablet-software-ipad-7.jpg)
Isoline
An isoline or contour line of a function of two variables
is a curve along which the function has a constant value. Isolines usually have a parallel trend.
Parallel lines are lines in a plane which do not intersect or touch each other at any point.
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