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Statements
1980
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symmetries and the generalized symmetries of systems of partial differential equations
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reduction in the number of variables
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Noether's theorem
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conservation laws
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nonlinear representations of Lie algebras
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vertical bracket of two differential operators on a vector bundle
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Lie algebra of projectable vector fields
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generalized vector fields
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exponential formulas
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Lie derivation
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generalized infinitesimal symmetries
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Bäcklund transformations between evolution equations
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