The equation shold be
| e r r ( t + Δ t ) | ≤ ( 1 + M 1 Δ t ) 3 | e r r ( t − 2 Δ t ) | [ 1 + ( 1 + M 1 Δ t ) + ( 1 + M 1 Δ t ) 2 ] ( 1 2 M 2 ( Δ t ) 2 + | ρ | ) . {\displaystyle \left|err\left(t+\Delta t\right)\right|\leq \left(1+M_{1}\Delta t\right)^{3}\left|err\left(t-2\Delta t\right)\right|\left[1+\left(1+M_{1}\Delta t\right)+\left(1+M_{1}\Delta t\right)^{2}\right]\left({\frac {1}{2}}M_{2}\left(\Delta t\right)^{2}+\left|\rho \right|\right).}
Return to errata.