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\section{Second-order decay, $A+A\to P$}  For example, These forms of $k(t)$ satisfy the bound $\mathcal{J}-\mathcal{L}^2 = 0$  in the case absence  of disorder, when $k_i(t)\to\omega$. This is straightforward to show for  the case of an  $i^{th}$-order reaction, with  the traditional integrated rate lawand a rate ``constant'', $k_i(t)\to\omega$, is  \begin{equation}  \frac{1}{C_i(t)^{i-1}} = \frac{1}{C_i(0)^{i-1}}+(i-1)\omega t.  \end{equation}  Normalizing the concentration profile, by comparing the concentration at a time $t$ to the initial concentration, leads to the and associated  survival function \begin{equation}  S_i(t) = \sqrt[i-1]{\frac{1}{1+(i-1)\omega tC_i(0)^{i-1}}}, tC_i(0)^{i-1}}}.  \end{equation}  In traditional kinetics, the rate coefficient of irreversible decay is assumed constant, in which case $k(t)\to\omega$. However, $k(t)\to\omega$, but  this will not be the case when the kinetics are statically or dynamically disordered. In these cases, we will use the above definitions of $k(t)$. Taking our definitions of the integrated rate law, survival function, and time dependent rate coefficient, we are able to apply them to to second order irreversible decay. The integrated second-order rate law gives the survival function  %\begin{equation}