- Structural stability
In
mathematics , structural stability is an aspect ofstability theory concerning whether a given function is sensitive to a small perturbation. The general idea is that a function or flow is structurally stable if any other function or flow close enough to it has similar dynamics (from thetopological viewpoint, analogous toLyapunov stability ), which essentially means that the dynamics will not change under small perturbations.Definition
Given a
metric space X,d) and ahomeomorphism fcolon X o X, we say that f is structurally stable if there is a neighborhood V} of f in operatorname{Homeo}(X) (the space of all homeomorphisms mapping X to itself endowed with thecompact-open topology ) such that every element of V} istopologically conjugate to f.If M is a compact smooth
manifold , a mathcal{C}^k diffeomorphism f is said to be mathcal{C}^k structurally stable if there is a neighborhood of f in operatorname{Diff}^k(M) (the space of all mathcal{C}^k diffeomorphisms from M to itself endowed with the strong mathcal{C}^k topology) in which every element is topologically conjugate to f.If X is a
vector field in the smooth manifold M, we say that X is mathcal{C}^k-structurally stable if there is a neighborhood of X in X}^k(M) (the space of all mathcal{C}^k vector fields on M endowed with the strong mathcal{C}^k topology) in which every element is topologically equivalent to X, i.e. such that every other field Y in that neighborhood generates a flow on M that is topologically equivalent to the flow generated by X.ee also
*
sensitive dependence on initial conditions
*stability
*homeostasis
*self-stabilization ,superstabilization
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