Unstable equilibrium refers to a state where a system, when slightly disturbed from its equilibrium position, experiences a tendency to move away from that position rather than returning to it. This occurs in systems where the restoring forces are not sufficient to bring the system back to equilibrium, often leading to significant changes in the system's state. In phase portraits, unstable equilibria are represented as points where trajectories diverge away, indicating the inherent instability of these equilibrium points.
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