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Questions of the kind "What's the name for a X that satisfies property Y?"

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Recognize this metric? Do you have a name for this metric on the product of spheres?

Take the product $S^2 \times S^2$ of two two-spheres, but perturb the product metric as follows. Think of each $S^2$ as the unit two-sphere in Euclidean 3-space in the standard way so that for $p …
Richard Montgomery's user avatar