Sudanese Möbius band: a minimal non-orientable surface in $S^3$ projected to $\mathbb{R}^3
The Sudanese Mobius band is a minimal surface in R4 (or equivalently in S3) that projects to a Mobius band in R3. Unlike the standard Mobius strip, which is flat, the Sudanese version inherits curvature from its higher-dimensional embedding. The surface is notable in differential geometry as an example of a minimal non-orientable surface, and its name refers to the nationality of its discoverers.
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