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Global regularity for a singular equation and local $$H^ 1$$ minimizers of a nondifferentiable functional. (English) Zbl 1048.35022
Let $$\Omega$$ be a bounded domain in $$\mathbb{R}^d$$. The author is mainly interested in nonnegative solutions to the equation $\begin{cases} -\Delta u+ u^{-\beta}=\lambda f(x,u)&\text{in }\Omega,\\ u= 0 &\text{on }\partial\Omega,\end{cases}\tag{1}$ where $$0<\beta< 1$$, $$\lambda> 0$$ and $$f: \Omega\times \mathbb{R}^+\to \mathbb{R}^+$$ is a nonnegative function. Under some suitable assumptions on $$f$$, the author proves optimal Hölder estimates up to the boundary for the maximal solution of (1).

##### MSC:
 35J60 Nonlinear elliptic equations 35B65 Smoothness and regularity of solutions to PDEs 35J25 Boundary value problems for second-order elliptic equations
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##### References:
 [1] Brezis H., C. R. Acad. Sci. Paris, Série I 317 pp 465– [2] Dávila J., J. Anal. Math. [3] M. Giaquinta, Annals of Math. Stud., Multiple integrals in the calculus of variations and nonlinear elliptic systems (Princeton University Press, 1983) p. 105. [4] DOI: 10.1007/BF01389324 · Zbl 0513.49003 · doi:10.1007/BF01389324 [5] Giaquinta M., Boll. Un. Mat. Ital. A (6) 3 pp 239– [6] DOI: 10.1017/S030821050002970X · Zbl 0805.35032 · doi:10.1017/S030821050002970X [7] DOI: 10.1512/iumj.1983.32.32001 · Zbl 0545.35013 · doi:10.1512/iumj.1983.32.32001
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