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1. CJM 2006 (vol 58 pp. 449)

Agarwal, Ravi P.; Cao, Daomin; Lü, Haishen; O'Regan, Donal
 Existence and Multiplicity of Positive Solutions for Singular Semipositone $p$-Laplacian Equations Positive solutions are obtained for the boundary value problem $\begin{cases} -( | u'| ^{p-2}u')' =\lambda f( t,u),\;t\in ( 0,1) ,p>1\\ u( 0) =u(1) =0. \end{cases}$ Here $f(t,u) \geq -M,$ ($M$ is a positive constant) for $(t,u) \in [0\mathinner{,}1] \times (0,\infty )$. We will show the existence of two positive solutions by using degree theory together with the upper-lower solution method. Keywords:one dimensional $p$-Laplacian, positive solution, degree theory, upper and lower solutionCategory:34B15
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