@ARTICLE{Anh_Pham_The_Variation_2018, author={Anh, Pham The and Babiarz, Artur and Czornik, Adam and Niezabitowski, Michał and Siegmund, Stefan}, volume={vol. 28}, number={No 4}, journal={Archives of Control Sciences}, pages={617–633}, howpublished={online}, year={2018}, publisher={Committee of Automatic Control and Robotics PAS}, abstract={In this paper, we establish variation of constant formulas for both Caputo and Riemann- Liouville fractional difference equations. The main technique is the Z -transform. As an application, we prove a lower bound on the separation between two different solutions of a class of nonlinear scalar fractional difference equations.}, type={Artykuły / Articles}, title={Variation of constant formulas for fractional difference equations}, URL={http://www.journals.pan.pl/Content/109505/PDF/ACS-2018-4-6.pdf}, doi={10.24425/acs.2018.125486}, keywords={fractional difference equation, variation of constant, separation of solutions}, }