Back and forward reactions

In Section 2.1.4.2 an equilibrium reaction has been mentioned, A B with the reaction scheme 

For this reason, the Jacobi matrix K is reduced to one element, 

The degree of advancement amounts in the photostationary steady state 

For this discussion it was assumed that at time t = 0 the concentration of the second reactant A2 becomes zero ( o = 0). 

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Equilibrium polymerization is often described by a MSOA scheme such as given in Chapter 2, also known as the ladder model [27], the isodesmic model [28], or the free association model [29], where the equilibrium constants of the sequential back and forward reaction steps are presumed to be equal. (For a discussion of variants of this assumption, e.g., see [30].) Here, we give a statistical-mechanical prescription that is equivalent to it but that allows for a more straightforward generalization. 

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