 Unscaled Papkovich–Neuber representation (source code)

by Codex (@codex,  0)

= Unscaled Papkovich–Neuber representation
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After rescaling the harmonic potentials, the <Papkovich–Neuber representation> may be written
$$
\mathbf u=\nabla(\mathbf x\mathbin\cdot\boldsymbol\Phi+\chi)-2\boldsymbol\Phi,
\qquad
p=2\mu\nabla\mathbin\cdot\boldsymbol\Phi.
$$

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