Hence a square is topologically equivalent to a circle but different from a figure 8.
Rubber sheet math.
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According to the rubber sheet model proposed by daugman 1.
It is sometimes called rubber sheet geometry because the objects can be stretched and contracted like rubber but cannot be broken.
This curves the coordinate system around the object much like an object in the universe curves the coordinate system it sits in.
Topology branch of mathematics sometimes referred to as rubber sheet geometry in which two objects are considered equivalent if they can be continuously deformed into one another through such motions in space as bending twisting stretching and shrinking while disallowing tearing apart or gluing together parts.
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For example a square can be deformed into a circle without breaking it but a figure 8 cannot.
A common analogy is placing a heavy object on a stretched out rubber sheet causing the sheet to bend downward.