Geometry of B\"acklund Transformations II: Monge-Amp\`ere Invariants
Abstract
This article is concerned with the question: For which pairs of hyperbolic Euler-Lagrange systems in the plane does there exist a rank-1 B\"acklund transformation relating them? We express some obstructions to such existence in terms of the local invariants of the Euler-Lagrange systems. In addition, we discover a class of B\"acklund transformations relating two hyperbolic Euler-Lagrange systems of distinct types.
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