Stability theory (nonfiction): Difference between revisions
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In [[Mathematics (nonfiction)|mathematics]], '''stability theory''' addresses the stability of solutions of [[Differential equation (nonfiction)|differential equations]] and of trajectories of [[Dynamical system (nonfiction)| | In [[Mathematics (nonfiction)|mathematics]], '''stability theory''' addresses the stability of solutions of [[Differential equation (nonfiction)|differential equations]] and of trajectories of [[Dynamical system (nonfiction)|dynamical systems]] under small perturbations of initial conditions. The heat equation, for example, is a stable partial differential equation because small perturbations of initial data lead to small variations in temperature at a later time as a result of the maximum principle. In partial differential equations one may measure the distances between functions using Lp norms or the sup norm, while in differential geometry one may measure the distance between spaces using the Gromov–Hausdorff distance. | ||
In [[Dynamical system (nonfiction)|dynamical systems]], an orbit is called Lyapunov stable if the forward orbit of any point is in a small enough neighborhood or it stays in a small (but perhaps, larger) neighborhood. Various criteria have been developed to prove stability or instability of an orbit. Under favorable circumstances, the question may be reduced to a well-studied problem involving eigenvalues of matrices. A more general method involves Lyapunov functions. In practice, any one of a number of different stability criteria are applied. | In [[Dynamical system (nonfiction)|dynamical systems]], an orbit is called Lyapunov stable if the forward orbit of any point is in a small enough neighborhood or it stays in a small (but perhaps, larger) neighborhood. Various criteria have been developed to prove stability or instability of an orbit. Under favorable circumstances, the question may be reduced to a well-studied problem involving eigenvalues of matrices. A more general method involves Lyapunov functions. In practice, any one of a number of different stability criteria are applied. | ||
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== Nonfiction cross-reference == | == Nonfiction cross-reference == | ||
* [[Chaos theory (nonfiction)]] | |||
* [[Differential equation (nonfiction)]] | * [[Differential equation (nonfiction)]] | ||
* [[Dynamical system (nonfiction)]] | * [[Dynamical system (nonfiction)]] | ||
Latest revision as of 17:51, 21 May 2018
In mathematics, stability theory addresses the stability of solutions of differential equations and of trajectories of dynamical systems under small perturbations of initial conditions. The heat equation, for example, is a stable partial differential equation because small perturbations of initial data lead to small variations in temperature at a later time as a result of the maximum principle. In partial differential equations one may measure the distances between functions using Lp norms or the sup norm, while in differential geometry one may measure the distance between spaces using the Gromov–Hausdorff distance.
In dynamical systems, an orbit is called Lyapunov stable if the forward orbit of any point is in a small enough neighborhood or it stays in a small (but perhaps, larger) neighborhood. Various criteria have been developed to prove stability or instability of an orbit. Under favorable circumstances, the question may be reduced to a well-studied problem involving eigenvalues of matrices. A more general method involves Lyapunov functions. In practice, any one of a number of different stability criteria are applied.
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Fiction cross-reference
Nonfiction cross-reference
- Chaos theory (nonfiction)
- Differential equation (nonfiction)
- Dynamical system (nonfiction)
- Mathematics (nonfiction)
External links:
- Stability theory @ Wikipedia