<b>Remarks on Kato's inequality when </b>∆<i><sub>p</sub></i><i>u </i><b>is a measure </b>

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<p>Let Ω be a bounded domain of RN (N ≥ 1). In this article, we shall study Kato'’s inequality when ∆pu is a measure, where ∆pu denotes a p-Laplace operator with 1 < p < ∞. The classical Kato'’s inequality for a Laplacian asserts that given any function u ∈ L1loc(Ω) such that ∆u ∈ L1loc(Ω), then ∆(u+) is a Radon measure and the following holds: ∆(u+) ≥ χ[u ≥ 0]∆u in D′(Ω). Our main result extends Kato’'s inequality to the case where ∆pu is a Radon measures on Ω. We also establish the inverse maximum principle for ∆p.</p>

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