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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Journal d Analyse Ma...arrow_drop_down
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
Journal d Analyse Mathématique
Article . 2000 . Peer-reviewed
License: Springer TDM
Data sources: Crossref
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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Radial and transverse variations of analytic functions

Authors: MacGregor, T. H.;

Radial and transverse variations of analytic functions

Abstract

If \(\Gamma\) is a curve given by \(w=w(t)\), \(a\leq t\leq b\), then the length of \(\Gamma\) is given by \(\int^b_a|w'(t)|dt\). If, instead of \(w'(t)\), the projection of the vector \(w'(t)\) onto the vector \(w(t)\) is used, the corresponding integral is \(\int^b_a|{\text{Re} \{\overline ww'\}\over w}|dt=\int^b_a |{d\over dt} |w||dt\) and is called the radial variation of the curve \(\Gamma\). If one projects the vector \(w'(t)\) onto \(iw(t)\), the analogous integral is \(\int^b_a |{\text{Im}\{\overline ww'\} \over w}|dt=\int^b_a |w{d\over dt} \text{arg} w|dt\) and is called the transverse variation of \(\Gamma\). If \(f\) is an analytic function in the unit disk, then the radial variation of the curve \(w=f(re^{it})\), \(0\leq t\leq 2\pi\), is \(\int_0^{2\pi} |f(re^{it}) \text{Im}\{{re^{it} f'(re^{it})\over f (re^{it})}\} |dt\). Let \(R^1\) denote the family of functions for which these integrals are bounded for \(00)\) denotes the family of functions \(f\) that are analytic in the unit disk and satisfy the condition \[ \sup_{00)\) denotes the family of functions \(f\) that are analytic in the unit disk and satisfy the condition \[ \sup_{00\) and \(\varphi\) is a conformal automorphism of the unit disk, then \(f \circ \varphi\in R^p\). Conjecture 2. If \(f\in T^p\) for some \(p>0\) and \(\varphi\) is a conformal automorphism of the unit disk, then \(f\circ \varphi\in T^p\).

Keywords

length of curves, Special classes of univalent and multivalent functions of one complex variable (starlike, convex, bounded rotation, etc.), Hardy classes, conformal mappings, \(H^p\)-classes

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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