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Existence results for some quasilinear elliptic problems with right handside in \(L^1\). (English) Zbl 0932.35072

Quasilinear elliptic equations of Leary-Lions type with the right hand side in \(L^{1}\) are considered. Two theorems on the existence of unbounded renormalized nonnegative solutions and their comparisons with a nonnegative supersolution are given. The existence of a nonnegative supersolution is assumed in the following two cases: in the first one, the existence of a supersolution of the symmetrized problem, and in the second one, the existence of a renormalized supersolution of the main problem. In order to prove the main results, the following three different methods are well combined and reproduced: the truncation method, the method of Schwarz symmetrization and the sub-super solution method [see L. Boccardo, F. Murat and J. P. Puel, Ann. Sc. Norm. Super. Pisa, Cl. Sci., IV. Ser. 11, 213-235 (1984; Zbl 0557.35051)].

MSC:

35J60 Nonlinear elliptic equations
35D05 Existence of generalized solutions of PDE (MSC2000)

Citations:

Zbl 0557.35051