Abstract
We prove existence of upper and lower solutions in reverse order with respect a part of the variables in a system of nonlinear ordinary di erential equations modelling acidogenesis in anaerobic digestion. The corresponding existence theorems are established. The upper and lower solutions are constructed analytically, by de ning semi-trivial solutions for each of the variables in the model. We introduce the concept of indicator semi-trivial solutions. Finally, we numerically solve the system supported by the Matlab software and matching the graphs of the numerical solutions with analytical solutions is found.
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Schedule a callMore From: Bulletin of the South Ural State University. Series "Mathematical Modelling, Programming and Computer Software"
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