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Created by Derrick Coetzee in Adobe Illustrator. From same source as en:Image:Continuity topology.png, which this replaces. Original comments on that image state:
I (Derrick Coetzee) created this image in Illustrator to demonstrate the topological formulation of continuity of a function at a point described on the page continuity (topology). It is loosely based on a similar image from Bartle's real analysis book.
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