TITLE: Cover of Shifrin Multivariable Mathematics with Manifolds?
QUESTION [1 upvotes]: Just curious, anyone knows what this image on the cover of Shifrin's textbook is? It doesn't seem to be a manifold.

REPLY [2 votes]: It's a real picture of (a slice of a portion of) the Riemann surface $z=w^3$. It's a branched covering of the complex plane, but it is actually a $2$-dimensional manifold.
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