Article
Keywords:
natural operator; Euler morphism; Helmholtz operator
Summary:
We deduce that all natural operators of the type of the Helmholtz map from the variational calculus in fibered manifolds are the constant multiples of the Helmholtz operator.
References:
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MR 1202431
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On the Helmholtz operator for Euler morphisms. Math. Proc. Camb. Phil. Soc. 135 (2003), 277–299.
MR 2006065