A fixed point for which the stability matrix has equal positive eigenvalues.
Unstable Improper Node
See also
Elliptic Fixed Point, Fixed Point, Hyperbolic Fixed Point, Stable Improper Node, Stable Node, Stable Spiral Point, Unstable Node, Unstable Spiral Point, Unstable StarExplore with Wolfram|Alpha
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.Referenced on Wolfram|Alpha
Unstable Improper NodeCite this as:
Weisstein, Eric W. "Unstable Improper Node." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/UnstableImproperNode.html