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However, we've never been concerned nor the vet because our dog has always been able to express them herself by licking whenever the need arises. Lately though, we noticed her licking alot more than usual. Of course, our vet is out on maternity leave so we had to see an alternate.
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In the context of the adaptive finite element method FEMZZ-error estimators named after Zienkiewicz and Zhu  are mathematically well-established and widely used in practice. In this work, we propose and analyze ZZ-type error estimators for the adaptive boundary element method BEM. We consider weakly singular and hyper-singular integral equations and prove, in particular, convergence of the related adaptive mesh-refining algorithms.
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