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Multiplicity results for positive solutions of a coupled system of singular boundary value problems. (English) Zbl 1260.34039

Summary: Existence of multiple positive solutions for a coupled system of nonlinear two-point singular boundary value problems \[ \begin{aligned} -x''(t) &= p(t) f(t,y(t), x'(t)),\quad t\in (0,1),\\ -y''(t) &= q(t) g(t, x(t), y'(t)),\quad t\in (0,1),\\ x(0) &= y(0)= x'(1)= y'(1)= 0,\end{aligned} \] is established. The nonlinearities \(f,g: [0,1]\times[0,\infty)\times (0,\infty)\to [0,\infty)\) are allowed to be singular at \(x'=0\) and \(y'=0\) and the functions \(p,q\in C(0,1)\) are positive on \((0,1)\). An example is also included to show the applicability of our result.

MSC:

34B18 Positive solutions to nonlinear boundary value problems for ordinary differential equations
47N20 Applications of operator theory to differential and integral equations
34B16 Singular nonlinear boundary value problems for ordinary differential equations