most citedOn generating relative and absolute invariants of linear differential equations

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math.OC2007

Symmetry properties of a nonlinear acoustics model

J. C. Ndogmo

We give a classification into conjugacy classes of subalgebras of the symmetry algebra generated by the Zabolotskaya-Khokhlov equation, and obtain all similarity reductions of this…

math.OC2007

Casimir operators of Lie algebras with a nilpotent radical

J. C. Ndogmo

We show that a Lie algebra having a nilpotent radical has a fundamental set of invariants consisting of Casimir operators. We give a different proof of this fact in the special and…