2013
DOI: 10.1016/j.aim.2012.09.029
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Quasilinear elliptic equations and weighted Sobolev–Poincaré inequalities with distributional weights

Abstract: We introduce a class of weak solutions to the quasilinear equation −∆ p u = σ|u| p−2 u in an open set Ω ⊂ R n with p > 1, where ∆ p u = ∇ · (|∇u| p−2 ∇u) is the p-Laplacian operator. Our notion of solution is tailored to general distributional coefficients σ which satisfy the inequalityAs we shall demonstrate, these conditions on λ are natural for the existence of positive solutions, and cannot be relaxed in general. Furthermore, our class of solutions possesses the optimal local Sobolev regularity available u… Show more

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Cited by 22 publications
(28 citation statements)
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“…As far as existence is concerned, the nonlinearity false|ufalse|p in is considered ‘to have the bad sign’ and by now it is well known that in order for to have a solution the datum σ must be both small and regular enough . In particular, if σ is a nonnegative distribution in normalΩ (that is, a nonnegative locally finite measure in normalΩ), then a necessary condition for the first equation in to have a W loc 1,pfalse(normalΩfalse) solution is that (see ) 0trueΩfalse|φfalse|pdσλΩfalse|φfalse|pdx1emfor4.ptall4.ptφCc(Ω),with λ=(p1)p1. Moreover, when σ0 the nonlinear term itself also obeys a similar Poincaré–Sobolev inequality 0trueΩfalse|φfalse|pfalse|ufalse|pdxAΩfalse|φfalse|pdx1emfor4.ptall4.ptφCc(Ω),with A=pp.…”
Section: Introductionmentioning
confidence: 99%
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“…As far as existence is concerned, the nonlinearity false|ufalse|p in is considered ‘to have the bad sign’ and by now it is well known that in order for to have a solution the datum σ must be both small and regular enough . In particular, if σ is a nonnegative distribution in normalΩ (that is, a nonnegative locally finite measure in normalΩ), then a necessary condition for the first equation in to have a W loc 1,pfalse(normalΩfalse) solution is that (see ) 0trueΩfalse|φfalse|pdσλΩfalse|φfalse|pdx1emfor4.ptall4.ptφCc(Ω),with λ=(p1)p1. Moreover, when σ0 the nonlinear term itself also obeys a similar Poincaré–Sobolev inequality 0trueΩfalse|φfalse|pfalse|ufalse|pdxAΩfalse|φfalse|pdx1emfor4.ptall4.ptφCc(Ω),with A=pp.…”
Section: Introductionmentioning
confidence: 99%
“…Remark If the factor false(p1false)1p on the right‐hand side of is dropped, then the smallness condition on λ becomes λ(0,p#), where p#=(p1)2p if p>2 and p#=1 if p2 as in . The sharpness of p# (and that of false(p1false)trueprefixminfalse{1,p1false} for ) was also justified in .…”
Section: Introductionmentioning
confidence: 99%
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“…Let V ∈ D admits a positive solution (in a certain weak sense) for any α ∈ (0, p ♯ ), where p ♯ < 1 is given explicitly and depends only on p (see [21,Theorem 1.2 (i)], or [20, Theorem 1.1 (i)] for p = 2). Moreover, this range for α is optimal as examples involving the Hardy potential reveals (see [21,Remark 1.3], or [20,Example 7.3] for p = 2). We note that under the above assumptions, the local Harnack inequality for positive solutions of (1.5) is in general not valid.…”
Section: Introductionmentioning
confidence: 99%