RT journal article T1 Existence and uniqueness of solutions for a class of discrete-time fractional equations of order 2 < α ≤ 3 A1 Leal, C. A1 Murillo Arcila, Marina A2 Matemáticas K1 Fractional Rieman-Liouville K1 resolvent families K1 maximal regularity K1 equation with memory K1 R-boundedness AB In this paper we consider a class of linear difference equations of fractional order $2 <\alpha< 3$in the sense of Riemann–Liouville. The explicit solution for this model is provided in termsof a fractional resolvent sequence which allows to write the solution to this equation as avariation of constant formula. We also characterize the existence and uniqueness of solutionsin $l_p(N0;X)$ spaces with X being a UMD-space in terms of the R-boundedness of the operatorsymbol of the model. Moreover, we are able to relax this condition in the case of Hilbert spaces.Finally, we illustrate our results with an example that involves the generator of a contractionsemigroup. PB Springer SN 1432-0606 YR 2022 FD 2022 LK http://hdl.handle.net/10498/35334 UL http://hdl.handle.net/10498/35334 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 11-nov-2026