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Estimates for Conformal Metric Ratios

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Abstract

We present uniform and pointwise estimates for various ratios of the hyperbolic, quasihyperbolic and Möbius metrics. We determine when these ratios are constant. We exhibit numerous illustrative examples.

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References

  1. R. Barnard, L. Cole, K. Pearce and B. Williams, A sharp bound on the Schwarzian derivatives of hyperbolically convex functions, J. London Math. Soc., to appear.

  2. C. Carathéodory, Theory of Functions of a Complex Variable, 2nd English ed., vol. 2, Chelsea Publ. Co., New York, 1960.

    Google Scholar 

  3. P. L. Duren, Univalent Functions, Grundlehern Math. Wiss., no. 259, Springer-Verlag, New York, 1983.

    Google Scholar 

  4. B. B. Flinn and D. A. Herron, Uniform estimates for the hyperbolic metric and Euclidean distance to the boundary, Michigan Math. J. 46 (1999), 13–27.

    Article  MathSciNet  MATH  Google Scholar 

  5. R. Harmelin, Hyperbolic metric, curvature of geodesics and hyperbolic disks in hyperbolic plane domains, Israel J. Math. 70 (1990), 111–128.

    Article  MathSciNet  MATH  Google Scholar 

  6. R. Harmelin and D. Minda, Quasi-invariant domain constants, Israel J. Math. 77 (1992), 115–127.

    Article  MathSciNet  MATH  Google Scholar 

  7. D. A. Hejhal, Universal covering maps for variable regions, Math. Z 137 (1974), 7–20.

    Article  MathSciNet  MATH  Google Scholar 

  8. J. A. Hempel, The Poincaré metric on the twice punctured plane and the theorems of Landau and Schottky, J. London Math. Soc. 20 (1979), 435–445.

    Article  MathSciNet  MATH  Google Scholar 

  9. D. A. Herron, Z. Ibragimov and D. Minda, Geodesics and curvature of Möbius invariant metrics, preprint.

  10. D. A. Herron, W. Ma and D. Minda, A Möbius invariant metric for regions on the Riemann sphere, in: Future Trends in Geometric Function Theory (Jyväskylä, Finland), no. 92, Dept. Math. Stat., Univ. Jyväskylä, 2003, RNC Workshop held in Jyväskylä, June 15–18, 2003, 101–118.

  11. J. R. Hilditch, The hyperbolic metric and the distance to the boundary, manuscript, 1984.

  12. V. Jørgensen, On an inequality for the hyperbolic measure and its applications to the theory of functions, Math. Scand. 4 (1956), 113–124.

    MathSciNet  Google Scholar 

  13. R. Kulkarni and U. Pinkall, A canonical metric for Möbius structures and its applications, Math. Z. 216 (1994), 89–129.

    Article  MathSciNet  MATH  Google Scholar 

  14. C. D. Minda, Estimates for the hyperbolic metric, Kodai Math. J. 8 (1985), 249–258.

    Article  MathSciNet  MATH  Google Scholar 

  15. —, Inequalities for the hyperbolic metric and applications to geometric function theory, in: Complex Analysis, I (College Park, MD, 1985–1986) (Berlin), Lecture Notes in Math., no. 1275, Springer-Verlag, 1987, 235–252.

  16. G. J. Martin and B. G. Osgood, The quasihyperbolic metric and associated estimates on the hyperbolic metric, J. Analyse Math. 47 (1986), 37–53.

    Article  MathSciNet  MATH  Google Scholar 

  17. Z. Nehari, Conformal Mapping, Dover Publ., Inc., New York, 1975.

    Google Scholar 

  18. A. Yu. Solynin, Functional inequalities via polarization, St. Petersburg Math. J. 8 (1997), 1015–1038.

    MathSciNet  Google Scholar 

  19. S. Y. Zhang, On schlicht Bloch constant, (Chinese with English summary), Beijing Daxue Xuebao 25 (1989), 537–540

    MathSciNet  MATH  Google Scholar 

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Correspondence to David A. Herron.

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The first and third authors were supported by the Charles Phelps Taft Research Center.

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Herron, D.A., Ma, W. & Minda, D. Estimates for Conformal Metric Ratios. Comput. Methods Funct. Theory 5, 323–345 (2006). https://doi.org/10.1007/BF03321101

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  • DOI: https://doi.org/10.1007/BF03321101

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2000 MSC

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