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Original Research
Published 24 August 2026
An error-certified matrix Mittag–Leffler perturbation method for weakly nonlinear fractional systems
Alvaro H. Salas · Gilder Cieza Altamirano · Lorenzo J. Martínez H
Frontiers in Applied Mathematics and Statistics
doi 10.3389/fams.2026.1899674
Original Research
Published 10 August 2026
Exchange rate volatility modeling: ARIMAX-FIGARCH with wavelet-based outlier detection for USD/PEN
Wilfredo Bazán-Ramírez · Miguel Ángel Bello-Bernal · Javier Antonio Prudencio-Vidal · Aldo Bazán-Ramírez · Amador Grover Mejía-Osorio · Ybar Gustavo Palomino-Malpartida · Edgar Gutiérrez-Gómez
Frontiers in Applied Mathematics and Statistics
doi 10.3389/fams.2026.1887882