Sobolev space on the unit sphere is usually defined with the help of spherical harmonics, but is there any reference where the equivalence to the classical fractional sobolev space definition is shown? And preferably also the construction of the classical fractional sobolev space. I would greatly appreciate it, thanks.
2026-03-26 03:18:50.1774495130
Reference recommendation for sobolev space on the unit sphere
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