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## Positive solutions to a class of elastic beam equations with semipositone nonlinearity

### Tom 97 / 2010

Annales Polonici Mathematici 97 (2010), 35-50 MSC: 34B15, 34B16, 34B18. DOI: 10.4064/ap97-1-3

#### Streszczenie

Let $h\in L^{1}[0,1]\cap C(0,1)$ be nonnegative and $f(t,u,v)+h(t)\geq 0$. We study the existence and multiplicity of positive solutions for the nonlinear fourth-order two-point boundary value problem $$u^{(4)}(t)=f(t,u(t),u^{\prime }(t)),\quad\ 0< t< 1,\quad\ u(0)=u^{\prime }(0)=u^{\prime }(1)=u^{\prime \prime \prime }(1)=0,$$ where the nonlinear term $f(t,u,v)$ may be singular at $t=0$ and $t=1$. By constructing a suitable cone and integrating certain height functions of $f(t,u,v)$ on some bounded sets, several new results are obtained. In mechanics, the problem models the deflection of an elastic beam fixed at the left end and clamped at the right end by sliding clamps.

#### Autorzy

• Qingliu YaoDepartment of Applied Mathematics
Nanjing University of Finance and Economics
Nanjing 210003, P.R. China
e-mail

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