A Recursion Operator for the Universal Hierarchy Equation via Cartan's
Method of Equivalence [PDF]
Oleg I. MorozovWe apply Cartan's method of equivalence to find a B\"acklund autotransformation for the tangent covering of the universal hierarchy equation. The transformation provides a recursion operator for symmetries of this equation.View original: http://arxiv.org/abs/1205.5748
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