Fractional Differential Calculus · Volume 11, Issue 1 A uniqueness criterion for nontrivial solutions of the nonlinear higher-order ∇-difference systems of fractional-order 11-06 Pages 85-110 DOI 10.7153/fdc-2021-11-06 Downloads Short PDF Full PDF PNG Authors Yousef Gholami Keywords fractional sums and differences coincidence degree theory existence uniqueness nontrivial solution Subject classes 34A08 34F15 39A12 39A10 34A12