Konopelchenko, BorisMartínez Alonso, LuisRagnisco, O.2023-06-202023-06-202001-11-300305-447010.1088/0305-4470/34/47/322https://hdl.handle.net/20.500.14352/59826©2001 IOP Publishing Ltd. L Martínez Alonso is partially supported by CICYT proyecto PB98–0821.The dispersionless limit of the scalar nonlocal a-problem is derived. It is given by a special class of nonlinear first-order equations. A quasiclassical version of the partial derivative -dressing method is presented. It is shown that the algebraic formulation of dispersionless hierarchies can be expressed in terms of properties of Beltrami-type equations. The universal Whitham hierarchy and, in particular, the dispersionless KP hierarchy turn out to be rings of symmetries for the quasiclassical partial derivative -problem.engjournal articlehttp://dx.doi.org/10.1088/0305-4470/34/47/322http://iopscience.iop.orghttp://arxiv.org/abs/nlin/0103023open access51-73Korteweg-devries equationIntegrable hierarchiesLimitModelsFísica-Modelos matemáticosFísica matemática