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Statements
1979
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transformation theory of partial differential equations
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contact transformations
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single-valued surface transformations
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surfaces of constant negative curvature
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Bianchi-Lie transformations
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Sine-Gordon
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Korteweg-de Vries equations
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Lie-Bäcklund groups
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tangent transformation groups of infinite order
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conservation laws
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differential equation derivable from a variational principle
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motion of a particle in de Sitter space-time
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Dirac equation
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fluid mechanics
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Bäcklund transformations
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nonlinear optics
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lattices
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diffusion
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nonlinear waves
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