Geodesic
The Normal Derivative Lemma for the Laplacian on a Polyhedral Set
Matematičeskie zametki, Tome 96 (2014) no. 1, pp. 116-125.

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An analog of the Oleinik–Hopf normal derivative lemma for the Laplace operator on a polyhedral set is considered.
Keywords: normal derivative, polyhedral set, stratified set, Laplace operator, simplicial complex. 
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S. N. Oshchepkova; O. M. Penkin; D. Savasteev. The Normal Derivative Lemma for the Laplacian on a Polyhedral Set. Matematičeskie zametki, Tome 96 (2014) no. 1, pp. 116-125. http://geodesic.mathdoc.fr/item/MZM_2014_96_1_a9/

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