On exact solutions of a class of fractional Euler-Lagrange equations

Details On exact solutions of a class of fractional Euler-Lagrange equations On exact solutions of a class of fractional Euler-Lagrange equations

2007-08-10

arxiv.org/abs/0708.1433v1

Physics

Mathematical Physics

10 pages, LATEX. in press, Nonlinear Dynamics

Scientific paper

In this paper, first a class of fractional differential equations are obtained by using the fractional variational principles. We find a fractional Lagrangian $L(x(t)$, where $_a^cD_t^\alpha x(t))$ and $0<\alpha< 1$, such that the following is the corresponding Euler-Lagrange % \begin{equation}_tD_b^\alpha(_a^cD_t^\alpha) x(t)+ b(t,x(t))(_a^cD_t^\alpha x(t))+f(t,x(t))=0. \end{equation} % At last, exact solutions for some Euler-Lagrange equations are presented. In particular, we consider the following equations % \begin{equation}_tD_b^\alpha(_a^cD_t^\alpha x(t))=\lambda x(t), (\lambda\in R) \end{equation} % \begin{equation}_tD_b^\alpha(_a^cD_t^\alpha x(t))+g(t)_a^cD_t^\alpha x(t)=f(t), \end{equation} where g(t) and f(t) are suitable functions.

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