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Painlevé analysis and similarity reductions for the magma equation. (English) Zbl 1132.35328
Summary: We examine a generalized magma equation for rational values of two parameters, $$m$$ and $$n$$. Firstly, the similarity reductions are found using the Lie group method of infinitesimal transformations. The Painlevé ODE test is then applied to the travelling wave reduction, and the pairs of $$m$$ and $$n$$ which pass the test are identified. These particular pairs are further subjected to the ODE test on their other symmetry reductions. Only two cases remain which pass the ODE test for all such symmetry reductions and these are completely integrable. The case when $$m=0, n =-1$$ is related to the Hirota-Satsuma equation and for $$m=\frac 12, n = -\frac 12$$, it is a real, generalized, pumped Maxwell-Bloch equation.

##### MSC:
 35C05 Solutions to PDEs in closed form 35Q58 Other completely integrable PDE (MSC2000) 37K10 Completely integrable infinite-dimensional Hamiltonian and Lagrangian systems, integration methods, integrability tests, integrable hierarchies (KdV, KP, Toda, etc.)
##### Keywords:
Painlevé analysis; similarity reductions; magma equation
SYMMGRP
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