An enhanced ultraspherical collocation framework with Chebyshev nodes for the time-fractional FitzHugh–Nagumo equation. - Youssri, Youssri Hassan; Shaikh, Muhammad Mujtaba; Batiha, Iqbal M.; Anakira, Nidal; Irianto, Irianto; Sasa, Tala (AIMS Mathematics, 2026)