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Finite distortion functions and Douglas-Dirichlet functionals

Qingtian Shi (2019)

Czechoslovak Mathematical Journal

In this paper, we estimate the Douglas-Dirichlet functionals of harmonic mappings, namely Euclidean harmonic mapping and flat harmonic mapping, by using the extremal dilatation of finite distortion functions with given boundary value on the unit circle. In addition, ¯ -Dirichlet functionals of harmonic mappings are also investigated.

Flows of Mellin transforms with periodic integrator

Titus Hilberdink (2011)

Journal de Théorie des Nombres de Bordeaux

We study Mellin transforms N ^ ( s ) = 1 - x - s d N ( x ) for which N ( x ) - x is periodic with period 1 in order to investigate ‘flows’ of such functions to Riemann’s ζ ( s ) and the possibility of proving the Riemann Hypothesis with such an approach. We show that, excepting the trivial case where N ( x ) = x , the supremum of the real parts of the zeros of any such function is at least 1 2 .We investigate a particular flow of such functions { N λ ^ } λ 1 which converges locally uniformly to ζ ( s ) as λ 1 , and show that they exhibit features similar to ζ ( s ) . For example, N λ ^ ( s ) ...

Fully starlike and fully convex harmonic mappings of order α

Sumit Nagpal, V. Ravichandran (2013)

Annales Polonici Mathematici

The hereditary properties of convexity and starlikeness for conformal mappings do not generalize to univalent harmonic mappings. This failure leads to the notions of fully starlike and fully convex mappings. In this paper, properties of fully starlike mappings of order α and fully convex mappings of order α (0 ≤ α < 1) are studied; in particular, the bounds for the radius of full starlikeness of order α as well as the radius of full convexity of order α are determined for certain families of...

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