Curves are continuous maps from an interval to a topological space. So a natural question is: is there any surface whose image is not the image of a continuous surjection from a rectangle to a topological space? Wikipedia's page about surfaces says "(...) there are surfaces for which there cannot exist a single parametrization that covers the whole surface." but doesn't give any example...
2026-02-26 22:32:41.1772145161
Are surfaces (equivalent to) continuous maps from rectangles?
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