| Abstract: |
| A powerful application of symmetries is finding symmetry-invariant solutions of nonlinear differential equations.
These solutions satisfy a reduced differential equation with one fewer independent variable.
It is well known that a double reduction occurs
whenever the starting nonlinear differential equation possesses a conservation law
that is invariant with respect to the symmetry.
Recent work has developed
a broad generalization of the double-reduction method
by considering the space of invariant conservation laws with respect to a given symmetry.
The generalization is able to reduce a nonlinear partial differential equation (PDE) in $n$ variables to an ODE with $m-n+2$ first integrals where $m$ is the dimension of the space of invariant conservation laws.
In the present talk,
we apply this general multi-reduction method to obtain travelling wave solutions of some physically interesting PDEs.
An interesting side result is that we show how conservation laws that explicitly contain the independent variables
can nevertheless be used under certain conditions to obtain a reduction. |
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