Tolong jelaskan mengenai . dari Persamaan pembezaan biasa dalam bahasa melayu

A. D. Polyanin, V. F. Zaitsev, and A. Moussiaux, Handbook of First Order Partial Differential Equations, Taylor & Francis, London, 2002.

D. Zwillinger, Handbook of Differential Equations (3rd edition), Academic Press, Boston, 1997.