An unstable node is a type of equilibrium point in a dynamical system where trajectories in its phase portrait move away from the node, indicating that any small perturbation will result in the system diverging from that point. This behavior signifies that the equilibrium is unstable, and it reflects the underlying system's sensitivity to initial conditions. In phase portraits, unstable nodes are visually represented as points with arrows indicating outward movement, emphasizing their role in characterizing system behavior near equilibrium.
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