Hyperbolic zero sequences on a punctured disk
ID: hyperbolic-zero-sequences-on-a-punctured-disk
The curvature-minus-one hyperbolic metric on the punctured disk assigns distance along the radial geodesic from to . Its exponential distances therefore sum to a finite value; the triangle inequality gives the same conclusion for any fixed basepoint. Nevertheless no nonzero bounded holomorphic function has these zeros: the Riemann removable singularity theorem extends it at zero, and the identity theorem then makes it identically zero. Simple connectivity is necessary in the hyperbolic characterization of bounded analytic zero sets.
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