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. The change of a product quantity is proportional to the quantity of one reactant.
The famous Brusselator model in which a chemical species X catalyses its own formation. In a certain region of parameter space the Brusselator can function in a limit cycle regime around an unstable steady state. Run this simulation and then check the report file to see how Gepasi can find an unstable steady state, and calculate the eigenvalues of the Jacobian matrix.