Unstable Node

A Fixed Point for which the Stability Matrix has both Eigenvalues Positive, so $\lambda_1>\lambda_2>0$.

See also Elliptic Fixed Point (Differential Equations), Fixed Point, Hyperbolic Fixed Point (Differential Equations), Stable Improper Node, Stable Node, Stable Spiral Point, Stable Star, Unstable Improper Node, Unstable Spiral Point, Unstable Star

References

Tabor, M. ``Classification of Fixed Points.'' §1.4.b in Chaos and Integrability in Nonlinear Dynamics: An Introduction. New York: Wiley, pp. 22-25, 1989.