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2019 | OriginalPaper | Buchkapitel

2. Notation and Preliminary Results

verfasst von : Ulrich Wilbrandt

Erschienen in: Stokes–Darcy Equations

Verlag: Springer International Publishing

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Abstract

In this chapter most of the notation used in this monograph is introduced; in particular, Lipschitz domains on which the so-called Lebesgue and Sobolev spaces are defined, together with a few basic inequalities. Furthermore, the important theorem of Lax–Milgram is shown. To begin with, some definitions and results from functional analysis are stated.

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Fußnoten
1
Sometimes also called elliptic; if the space is not clear it is often explicitly mentioned as X-coercivity or X-ellipticity.
 
2
Also called adjoint.
 
3
Here and in what follows B(x 0, α) ⊂ X denotes the ball around x 0 with radius α, i.e., https://static-content.springer.com/image/chp%3A10.1007%2F978-3-030-02904-3_2/470501_1_En_2_IEq66_HTML.gif . Furthermore, for sets M, N ⊂ X and a real number a the product aM and the sum M + N have to be understood element-wise: https://static-content.springer.com/image/chp%3A10.1007%2F978-3-030-02904-3_2/470501_1_En_2_IEq67_HTML.gif , https://static-content.springer.com/image/chp%3A10.1007%2F978-3-030-02904-3_2/470501_1_En_2_IEq68_HTML.gif .
 
4
Note that https://static-content.springer.com/image/chp%3A10.1007%2F978-3-030-02904-3_2/470501_1_En_2_IEq86_HTML.gif .
 
5
In this work it is always assumed that infima or suprema are taken with respect to a set for which the following expression is defined. In this case, this means x ∈ X and x≠0.
 
6
In the case p = q = 2 the Hölder inequality is the Cauchy–Schwarz inequality (2.1).
 
7
The derivative D α v is defined as https://static-content.springer.com/image/chp%3A10.1007%2F978-3-030-02904-3_2/470501_1_En_2_IEq150_HTML.gif .
 
8
Some generalization on Rademacher’s theorem can be found in [EG92].
 
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Metadaten
Titel
Notation and Preliminary Results
verfasst von
Ulrich Wilbrandt
Copyright-Jahr
2019
DOI
https://doi.org/10.1007/978-3-030-02904-3_2