Isolated singularities of polyharmonic inequalities
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We study nonnegative classical solutions u of the polyharmonic inequality. -mu0inB1(0)-{0}cRn. We give necessary and sufficient conditions on integers n2 and m1 such that these solutions u satisfy a pointwise a priori bound as x0. In this case we show that the optimal bound for u is u(x)=O((x))asx0 where is the fundamental solution of - in Rn. 2011 Elsevier Inc.