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This paper is devoted to study the energy content of colliding plane wavesusing approximate Noether symmetries. For this purpose, we use approximate Liesymmetry method of Lagrangian for differential equations. We formulate thefirst-order perturbed Lagrangian for colliding plane electromagnetic andgravitational waves. It is shown that in both cases, there does not exist

Energy Content of Colliding Plane Waves using Approximate Noether Symmetries