A three-spheres theorem holds for harmonic functions in weighted L2 norm on non-concentric non-touching spheres in R^n via inversion, extending the concentric case with applications to uniqueness.
Agmon,Unicit´ e et convexit´ e dans les probl` emes diff´ erentiels, S´ em
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Three-spheres theorem for harmonic functions (non-concentric case)
A three-spheres theorem holds for harmonic functions in weighted L2 norm on non-concentric non-touching spheres in R^n via inversion, extending the concentric case with applications to uniqueness.