Hodograph solutions of the dispersionless coupled KdV hierarchies, critical points and the Euler-Poisson-Darboux equation
B. Konopelchenko, L. Martinez Alonso, E. Medina

TL;DR
This paper explores how hodograph solutions of dispersionless coupled KdV hierarchies relate to critical points of a function satisfying the Euler-Poisson-Darboux equation, revealing connections to singular sectors and shock singularities.
Contribution
It establishes a link between hodograph solutions of dcKdV hierarchies and critical points of an Euler-Poisson-Darboux function, including higher genus hierarchies and shock solutions.
Findings
Hodograph solutions correspond to critical points of a scalar function.
Singular sectors are described by higher genus dcKdV hierarchies.
Concrete shock-type solutions are constructed.
Abstract
It is shown that the hodograph solutions of the dispersionless coupled KdV (dcKdV) hierarchies describe critical and degenerate critical points of a scalar function which obeys the Euler-Poisson-Darboux equation. Singular sectors of each dcKdV hierarchy are found to be described by solutions of higher genus dcKdV hierarchies. Concrete solutions exhibiting shock type singularities are presented.
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