On conformal capacity and Teichmüller’s modulus problem in space

We solve an extremal problem for the conformal capacity of certain space condensers. The extremal condenser is conformally equivalent to Teichmüller’s ring. As an application, we give a dimension-free estimate for the minimal conformal capacity of the condensers with platesE, F such thata, b ∈ E,c, d ∈ F, wherea, b, c, d are given points in\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$\overline R ^n $$ \end{document}.