Table 1 The error for difference time step at $\mathit{t}\mathbf{=}\mathbf{0.5}$

Δt

err(0.5,Δt)

$\frac{err\mathbf{(}\mathbf{0.5}\mathbf{,}\mathbf{\Delta }\mathit{t}\mathbf{)}}{\mathbf{\Delta }\mathit{t}}$

$\frac{err\mathbf{(}\mathbf{0.5}\mathbf{,}\mathbf{\Delta }\mathit{t}\mathbf{)}}{{\mathbf{(}\mathbf{\Delta }\mathit{t}\mathbf{)}}^{\mathbf{2}}}$