  In this paper we present a difference algebraic technique for the evaluation
of the Einstein's strength of a system of partial difference equations and
apply this technique to the comparative analysis of difference schemes for
chemical reaction-diffusion equations. In particular, we analyze
finite-difference schemes for the Murray, Fisher, Burgers and some other
reaction-diffusion equations, as well as mass balance PDEs of chromatography
from the point of view of their strength.
