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

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Fig. 46 — Singularity on pacman: Energy error $‖ ϕ - Φ_{k} ‖_{V}$ and estimator $η_{k}$ of Algorithm 10 for splines of degree p are plotted versus the number of degrees of freedom. Uniform and adaptive ( $θ = 0.75$ ) refinement is considered