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Zbl 0903.34016
Eloe, P.W.; Henderson, J.
Singular nonlinear multipoint conjugate boundary value problems. (English)
[J] Commun. Appl. Anal. 2, No.4, 497-511 (1998). ISSN 1083-2564

The authors prove the existence of solutions for the multipoint conjugate boundary value problem $$y^{(n)} = f(x,y), \quad x \in [0,1]\setminus \{a_1,a_2,\dots,a_k\},\tag 1$$ $$y^{(j)} (a_i) = 0, \quad 0 \leq j \leq n_i-1,\ 1 \leq i \leq k,\tag 2$$ where \ $0 = a_1 < a_2 < \dots < a_k = 1$ are fixed and $f(x,y)$ has a singularity at $y=0$. The approach of the authors is to construct a sequence of perturbations of $f$ which terms lack the singularity of $f$ and to apply a fixed point theorem to the respective boundary value problems. It is shown that the obtained sequence of iterates converges to a solution to (1), (2).
[Drumi Bainov (Sofia)]

MSC 2000:: *34B10 Multipoint boundary value problems
34B15 Nonlinear boundary value problems of ODE

Keywords: multipoint boundary value problems; singularity

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