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. 2022 Sep 30;29(7):4479–4555. doi: 10.1007/s11831-022-09752-5

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Fig. 29 — Test with edge singularities: residual estimator and energy error $| u - U_{k} |_{H^{1} (Ω)}$ for degree $p = 4$ . Results for $H$ -admissible and $T$ -admissible meshes of class $μ = 2$ , and for non-admissible meshes