Abstract
In this paper, the existence of positive solutions for a class of fractional differential equations with Riemann–Stieltjes integral boundary conditions are investigated under some weak conditions concerning the spectral analysis of the relevant linear operator and Gelfand’s formula by means of the fixed point index theorem in cones. The nonlinearity permits singularities not only at \(t=0,1,\) but also at \(x_{i}=0\ (i=1,2,\ldots ,n-1)\). The results obtained herein generalize and improve some known results including singular and non-singular cases.
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