Errata: Extra term \xi f in derivation of reaction rate equations in Section 2.1

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Location: page 35, line 16, -11

The term $\xi _{f}$ in the displayed equations for $n_{\text{AB}}(t+dt)$ and $[{\text{AB}}](t+dt)-[{\text{AB}}](t)$ should be removed. In the derivation of the reaction rate equations, the propensity functions are evaluated at the current state.

The corrected equations are

$n_{\text{AB}}(t+dt)=n_{\text{AB}}(t)+a_{f}({\color {blue}q})dt-a_{r}(q)dt,$

and

${\begin{aligned}[{\text{AB}}](t+dt)-[{\text{AB}}](t)&={\Bigl (}a_{f}({\color {blue}q},t)-a_{r}(q){\Bigr )}/\Omega \cdot dt\\&={\Bigl (}k_{f}n_{\text{A}}n_{\text{B}}/\Omega ^{2}-k_{r}n_{\text{AB}}/\Omega {\Bigr )}\,dt\\&={\Bigl (}k_{f}[{\text{A}}][{\text{B}}]-k_{r}[{\text{AB}}]{\Bigr )}\,dt.\end{aligned}}$

(Contributed by D. Del Vecchio, 10 Sep 2014)

This error appears in version 1.1a and earlier versions of the text.