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On the surjectivity of the almost linear operator and its applications
Authors:Wu Shaoping
Affiliation:1. Department of Applied Mathematics, Zhejiang University, Zhejiang, China
Abstract:LetL be a self-adjoint linear operator andN be the gradient of a functional ϕ, which is almost quadratic. We first give a theorem on the surjectivity of the operatorL+N, then apply the result to semilinear elliptic systems:

$$begin{gathered}   - Delta u + g_u (u,v) = f_1 (x), inOmega , hfill    - Delta v + g_v (u,v) = f_2 (x), inOmega , hfill   uleft| {_{partial Omega }  = 0,v} right|_{partial Omega }  = 0. hfill  end{gathered} $$
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