Friedman, AvnerHerrero, Miguel A.2023-06-202023-06-201992-060022-247X10.1016/0022-247X(92)90244-8https://hdl.handle.net/20.500.14352/57759A simple model of chemical kinetics with two concentrations u and v can be formulated as a system of two parabolic variational inequalities with reaction rates v(p) and u(q) for te diffusion processes of u and v, respectively. It is shown that if pq < 1 and the initial values of u and v are “comparable” then at least one of the concentrations becomes extinct in finite time. On the other hand, for any p = q > 0 there are initial values for which both concentrations do not become extinct in any finite time.engjournal articlehttp://www.sciencedirect.com/science/article/pii/0022247X92902448http://www.sciencedirect.comrestricted access517.9Model of chemical kinetics with two concentrationsEcuaciones diferenciales1202.07 Ecuaciones en Diferencias