%0 Journal Article
%T Positive solutions for fractional differential equations with variable coefficients
%A Yi Chen
%A Zhanmei Lv
%J Electronic Journal of Differential Equations
%D 2012
%I Texas State University
%X In this article, we study the existence of the positive solutions for a class of differential equations of fractional order with variable coefficients. The equation of this type plays an important role in the description and modeling of control systems, such as $PD^{mu}$-controller. The differential operator is taken in the Riemann-Liouville sense. Our analysis relies on the Leggett-Williams fixed point theorem.
%K Fractional differential equations
%K fixed point theorem
%K positive solution
%K multiplicity solution
%U http://ejde.math.txstate.edu/Volumes/2012/80/abstr.html