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Zbl 1160.34313
Wong, P. J. Y.; Agarwal, R. P.
Multiple solutions for a system of $(n_i p_i)$ boundary value problems.
(English)
[J] Z. Anal. Anwend. 19, No. 2, 511-528 (2000). ISSN 0232-2064; ISSN 1661-4534/e

Summary: We consider the system of boundary value problems $$\cases u^{(n_i)}_i(t)+f_i(t,u_1(t),\dots,u_m(t))=0\\ u^{(j)}_i(0)=0,\quad u^{(p_i)}_i(1)=0\endcases$$ for $t\in[0,1]$, $i=1,\dots,m$ and $0\leq j\leq n_i-2$ where $n_i\geq 2$ and $1\leq p_i\leq n_i-1$. Several criteria are offered for the existence of single and twin solutions of the system that are of fixed signs.
MSC 2000:
*34B15 Nonlinear boundary value problems of ODE

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