Abdul Kareem, S. 2026. Partial Derivatives : Extreme Values and Saddle Points (Modified): Partial Derivatives : Extreme Values and Saddle Points (Modified). Journal of Advanced Sciences and Nanotechnology. 1, 1 (Jun. 2026), 1–6. DOI:https://doi.org/10.55945/joasnt.2026.1.1.1-6.