
doi: 10.1007/bf01078385
series of invariant differential operators, Invariance and symmetry properties for PDEs on manifolds, Partial differential equations on manifolds; differential operators, invariant n-ary differential operator, algebra of polynomial vector fields on the line
series of invariant differential operators, Invariance and symmetry properties for PDEs on manifolds, Partial differential equations on manifolds; differential operators, invariant n-ary differential operator, algebra of polynomial vector fields on the line
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