Order of Differential Equation/Examples/Second Order

Examples of Orders of Differential Equations
The following ordinary differential equations are of the $2$nd order:


 * $\dfrac {\d^2 y} {\d x^2} = \dfrac 1 {1 - x^2}$


 * $\map {f'} x = \map {f''} x$


 * $y'' + \paren {3 y'}^3 + 2 x = 7$