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math.CV2020
Subharmonic Functions, Conformal Metrics, and CAT(0)
David A. Herron, Gaven J. Martin
We present an analytical proof that certain natural metric planar universal covers are Hadamard metric spaces. In particular if where is locally Lipschitz and subh…
math.CV2020
Quasihyperbolic Metric Universal Covers
David A. Herron, Gaven J. Martin
We present a simple analytical proof that the natural metric universal cover of a quasihyperbolic planar domain is a complete Hadamard metric space.