##
**Second-order functional problems with a resonance of dimension one.**
*(English)*
Zbl 1347.34034

From the author’s abstract: We obtain solvability conditions, for all possible resonance scenarios, for a differential equation of the form
\[
u''=f(t,u,u')
\]
with linear functional conditions \(B_1(u)=0\) and \(B_2(u)=0\) such that the kernel of the linear map
\[
L:\{ u\in C^1[0,1]\, :\, B_1(u)=B_2(u)=0\}\to L_1[0,1],\quad Lu=u''
\]
has dimension 1. Our work generalizes and improves the results of Z. Zhao and J. Liang [J. Math. Anal. Appl. 373, No. 2, 614–634 (2011; Zbl 1208.34020)] and Y. Cui [Electron. J. Differ. Equ. 2012, Paper No. 45, 9 p. (2012; Zbl 1244.34020)]. We also construct an example of a nonlinear functional problem for a pendulum equation which not only satisfies the assumptions of an existence theorem but also has a closed form solution.

Reviewer: Adriana Buică (Cluj-Napoca)

### MSC:

34B10 | Nonlocal and multipoint boundary value problems for ordinary differential equations |

34B15 | Nonlinear boundary value problems for ordinary differential equations |

47N20 | Applications of operator theory to differential and integral equations |

### Keywords:

second order differential equations; functional conditions; resonance; pendulum equation; coincidence degree theory
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\textit{N. Kosmatov} and \textit{W. Jiang}, Differ. Equ. Appl. 8, No. 3, 349--365 (2016; Zbl 1347.34034)

Full Text:
DOI

### References:

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