The δ‐function counterion condensate around a line charge derived from the Fuoss, Katchalsky, and Lifson polyelectrolyte theory

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Abstract
It has recently been proven that the counterion condensate around an isolated line charge in an electrolyte, as characterized by nonlinear Poisson‐Boltzmann theory, is an encapsulating δ‐function. Here the identical result is shown to hold in the framework of the polyelectrolyte theory of Fuoss, Katchalsky, and Lifson. The proof fully exploits analytic solutions to the differential equation which are not available for the nonlinear, cylindrical Poisson‐Boltzmann equation.