Criteria for Finite-Time Convergence in Discrete Variable-Order Fractional FitzHugh–Nagumo Reaction–Diffusion Systems. Eur. J. Pure Appl. Math. [Internet]. 2025 Nov. 5 [cited 2025 Dec. 5];18(4):7005. Available from: https://www.ejpam.com/index.php/ejpam/article/view/7005