Existence of strictly positive solutions for sublinear elliptic problems in bounded domains

Let $Ω$ be a smooth bounded domain in $\mathbb{R}^{N}$ and let $m$ be a possibly discontinuous and unbounded function that changes sign in $Ω$. Let $f:\left[ 0,\infty\right) \rightarrow\left[ 0,\infty\right)$ be a continuous function such that $k_{1}ξ^{p}\leq f\left(ξ\right) \leq k_{2}ξ^{p}$ for all $ξ\geq0$ and some $k_{1},k_{2}>0$ and $p\in\left(0,1\right)$. We study existence and nonexistence of strictly positive solutions for nonlinear elliptic problems of the form $-Δu=m\left(x\right) f\left(u\right)$ in $Ω$, $u=0$ on $\partialΩ$.

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