## The Ambrosetti–Prodi problem for the $$p$$-Laplace operator.(English)Zbl 1101.35033

The authors consider the quasilinear boundary value problem $-\Delta_p u=f(u)+t\phi(x)+h(x) \tag{1}$ on a bounded domain $$\Omega\subseteq\mathbb R^N$$ with homogeneous Dirichlet boundary conditions. Here $$\Delta_p$$ denotes the $$p$$-Laplacian for $$p>1$$, $$\phi,h\in L^\infty(\Omega)$$, and $$\phi$$ is positive. The function $$f$$ is asymptotically $$p$$-linear, with different coefficients at $$-\infty$$ and $$\infty$$ (“jumping nonlinearity”). Inspired by H. Brezis and L. Nirenberg [C. R. Acad. Sci., Paris, Sér. I 317, No. 5, 465–472 (1993; Zbl 0803.35029)] it is proved that there exist $$t_*\leq t^*$$ such that (1) admits at least two solutions for $$t<t_*$$, at least one solution for $$t\leq t^*$$, and no solution for $$t>t^*$$. If $$t<t_*$$ the existence of one solution follows from the existence of a sub- and a supersolution. A second solution is found by degree arguments. In order to apply degree theory the authors prove a strong comparison principle for solutions of (1). If $$p\geq2$$ then conditions are given to ensure that $$t_*=t^*$$.

### MSC:

 35J65 Nonlinear boundary value problems for linear elliptic equations 35J60 Nonlinear elliptic equations 35J25 Boundary value problems for second-order elliptic equations 47H07 Monotone and positive operators on ordered Banach spaces or other ordered topological vector spaces 47H11 Degree theory for nonlinear operators 58E07 Variational problems in abstract bifurcation theory in infinite-dimensional spaces

Zbl 0803.35029
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### References:

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