Article Outline
Glossary
Definition of the Subject
Introduction
Poincaré Operator and Linear Systems
Boundedness and Periodicity
Fixed Point Approach: Perturbation Theory
Fixed Point Approach: Large Nonlinearities
Guiding Functions
Lower and Upper Solutions
Direct Method of the Calculus of Variations
Critical Point Theory
Future Directions
Bibliography
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Abbreviations
- Banach fixed point theorem:
-
If M is a complete metric space with distance d, and \( f \colon M \to M \) is contractive, i. e. \( d(f(u),f(v)) \leq \alpha d(u,v) \) for some \( \alpha \in [0,1) \) and all \( u,v \in M \), then f has a unique fixed point \( u^{\ast}\) and \( u^{\ast} = \lim_{k \to \infty} f^k(u_{0}) \) for any \( u_{0} \in M \).
- Brouwer degree:
-
An integer \( d_{B}[f,\Omega] \) which ‘algebraically’ counts the number of zeros of any continuous mapping \( f \colon \overline \Omega \subset {\mathbb R}^n \to {\mathbb R}^n \) such that \( 0 \not \in f(\partial \Omega) \), and is invariant for sufficiently small perturbations of f. If f is of class \( C^1 \) and its zeros are non degenerate, then \( d_{B}[f,\Omega] = \sum_{x \in f^{-1}(0)} {\rm sign}\;{\rm det} f^{\prime}(x) \).
- Brouwer fixed point theorem:
-
Any continuous mapping \( f \colon B \to B \), with B is homeomorphic to the closed unit ball in \({\mathbb R}^n \), has at least one fixed point.
- Leray–Schauder degree:
-
The extension \( d_{LS}[I - g,\Omega] \) of the Brouwer degree, where Ω is an open bounded subset of the Banach space X, and \( g \colon \overline \Omega \to X \) is continuous, \( g(\overline \Omega) \) is relatively compact and \( 0 \not \in (I-g)(\partial \Omega) \).
- Leray–Schauder–Schaefer fixed point theorem:
-
If X is a Banach space, \( g \colon X \to X \) is a continuous mapping taking bounded subsets into relatively compact ones, and if the set of possible fixed points of \( \varepsilon g \) \( (\varepsilon \in [0,1]) \) is bounded independently of ε, then g has at least one fixed point.
- Ljusternik–Schnirelmann category:
-
The Ljusternik–Schnirelmann category \( \operatorname{cat}(M) \) of a metric space M into itself is the smallest integer k such that M can be covered by k sets contractible in M.
- Lower and upper solutions:
-
A lower (resp. upper) solution of the periodic problem \( u^{\prime\prime} = f(t,u) \), \( u(0) = u(T) \), \( u^{\prime}(0) = u^{\prime}(T) \) is a function α (resp. β) of class \( C^2 \) such that \( \alpha^{\prime\prime}(t) \geq f(t,\alpha(t))\), \( \alpha(0) = \alpha(T)\), \( \alpha^{\prime}(0) \geq\alpha^{\prime}(T) \) (resp. \(\beta^{\prime\prime}(t) \leq f(t,\beta(t)), \beta(0) = \beta(T), \beta^{\prime}(0) \leq \beta^{\prime}(T)\).
- Palais–Smale condition for a \( C^1 \) function \( \varphi \colon X \to \mathbb R \) :
-
Any sequence \( (u_{k})_{k \in \mathbb N}\) such that \( (\varphi(u_{k}))_{k \in \mathbb N}\) is bounded and \( \lim_{k \to \infty}\varphi^{\prime}(u_{k}) = 0 \) contains a convergent subsequence.
- Poincaré operator :
-
The mapping defined in \({\mathbb R}^n \) by \( P_{T} \colon y \mapsto p(T;y) \), where \( p(t;y) \) is the unique solution of the Cauchy problem \( x^{\prime} = f(t,x),\; x(0)=y \).
- Schauder fixed point theorem:
-
If C is a closed bounded convex subset of a Banach spaxe X, any continuous mapping \( g \colon C \to C \) such that \( g(C) \) is relatively compact has at least one fixed point.
- Sobolev inequality:
-
For any function \( u \in L^2(0,T) \) such that \( u^{\prime} \in L^2(0,T) \) and \( \int_{0}^T u(t)\text{d} t = 0 \), one has \( \max_{t \in [0,T]} |u(t)| \leq (T^{1/2}/2\sqrt 3)[\int_{0}^T |u^{\prime}(t)|^2\text{d} t ]^{1/2}\).
- Wirtinger inequality:
-
For any function \( u \in L^2(0,T) \) such that \( u^{\prime} \in L^2(0,T) \) and \( \int_{0}^T u(t)\text{d} t = 0 \), one has \( \int_{0}^T |u(t)|^2\text{d} t \leq \left(T^2\left/4\pi^2\right.\right)\int_{0}^T |u^{\prime}(t)|^2\text{d} t \).
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Mawhin, J. (2012). Periodic Solutions of Non-autonomous Ordinary Differential Equations. In: Meyers, R. (eds) Mathematics of Complexity and Dynamical Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-1806-1_75
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