Abstract:
We obtain a basis of joint or proper di#erential invariants for the scalar linear hyperbolic partial di#erential equation in two independent variables by the infinitesimal method. The joint invariants of the hyperbolic equation consist of combinations of the coe#cients of the equation and their derivatives which remain invariant under equivalence transformations of the equation and are useful for classification purposes. We also derive the operators of invariant di#erentiation for this type of equation. Furthermore, we show that the other di#erential invariants are functions of the elements of this basis via their invariant derivatives. Applications to hyperbolic equations that are reducible to their Lie canonical forms are provided. 1
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