mass action rate law for irreversible reactions mass action rate law for irreversible reactions, discrete scheme <n0:math xmlns:n0="http://www.w3.org/1998/Math/MathML"> <n2:semantics xmlns:n2="http://biomodels.net/SBO/" definitionURL="http://biomodels.net/SBO/#SBO:0000063"> <n2:lambda> <n2:bvar><n2:ci definitionURL="http://biomodels.net/SBO/#SBO:0000155">c</n2:ci></n2:bvar> <n2:bvar><n2:ci definitionURL="http://biomodels.net/SBO/#SBO:0000157">n</n2:ci></n2:bvar> <n2:bvar><n2:ci definitionURL="http://biomodels.net/SBO/#SBO:0000158">mu</n2:ci></n2:bvar> <n2:bvar><n2:ci definitionURL="http://biomodels.net/SBO/#SBO:0000508">R</n2:ci></n2:bvar> <n2:apply> <n2:times /> <n2:ci>c</n2:ci> <n2:apply> <n2:product /> <n2:bvar><n2:ci> i </n2:ci></n2:bvar> <n2:lowlimit><n2:cn type="integer"> 0 </n2:cn></n2:lowlimit> <n2:uplimit><n2:ci> n </n2:ci></n2:uplimit> <n2:apply> <n2:divide /> <n2:apply> <n2:factorial /> <n2:apply> <n2:selector /> <n2:ci type="vector">R</n2:ci> <n2:ci> i </n2:ci> </n2:apply> </n2:apply> <n2:apply> <n2:times /> <n2:apply> <n2:factorial /> <n2:apply> <n2:minus /> <n2:apply> <n2:selector /> <n2:ci type="vector">R</n2:ci> <n2:ci> i </n2:ci> </n2:apply> <n2:apply> <n2:selector /> <n2:ci type="vector">mu</n2:ci> <n2:ci> i </n2:ci> </n2:apply> </n2:apply> </n2:apply> <n2:apply> <n2:factorial /> <n2:apply> <n2:selector /> <n2:ci type="vector">mu</n2:ci> <n2:ci> i </n2:ci> </n2:apply> </n2:apply> </n2:apply> </n2:apply> </n2:apply> </n2:apply> </n2:lambda> </n2:semantics> </n0:math> Reaction scheme where the products are created from the reactants and the change of a product quantity is proportional to the product of reactant activities. The reaction scheme does not include any reverse process that creates the reactants from the products. It is to be used in a reaction modelled using a discrete framework.