unstable equilibrium

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un·sta·ble e·qui·lib·ri·um

equilibrium in which the response to a small perturbation will tend to make the perturbation greater (for example, a logged feedback process of zero order).
References in periodicals archive ?
Price ceilings were used to force economic activity into regions near but not at the unstable equilibria of the models.
Numerical integrations were carried out for a range of parameter values for systems with unstable equilibria; in all cases examined, the unstable equilibria were surrounded by a limit cycle.
A and C represent unstable equilibria, while B is stable.