📅 7 April 1921
Obi became a pioneering Nigerian mathematician known for research on nonlinear differential equations.
📅 7 April 1921
His work examined conditions under which nonlinear equations produce repeating behaviour and algebraic limit cycles.
📅 7 April 1921
Obi taught and supervised research as African universities expanded beyond colonial educational structures.
📅 7 April 1921
He also organized politically and argued about Nigeria's development, showing that mathematicians can participate directly in public struggles.
