@lerk @rysiek

Funny. :)

However, the equator of a constant-curvature hypersphere (S^3) is a perfectly flat 2-sphere (S^2), so in this context (irrelevant to the Earth's surface), a 2-sphere is perfectly flat (with no edges).

One dimension down, the equator of a constant-curvature 2-sphere (S^2) is a perfectly straight 1-sphere (S^1), commonly known as a "circle" (with no end points).

#RiemannianManifolds

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