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National Repository of Grey Literature 3 records found  Search took 0.02 seconds. 
Stabilní tekutiny ve vnějších oblastech
 Dopita, Jan ; Schwarzacher, Sebastian (advisor) ; Češík, Antonín (referee)
This thesis deals with Stokes and Navier-Stokes descriptions of flow of steady fluids in exterior domain and mainly focuses on presenting Liouville-like results for both cases. Firstly, we introduce the concept of weak derivative and spaces of appropriate functions. Following that, we talk about Stokes flow of incompressible fluids in R2 . We define a notion of a weak solution and we prove the Stokes paradox for generalized solutions in two-dimensional case, which is the main focus of this thesis. In the final chapter we then investigate the Navier- Stokes formulation where we again derive a notion of a weak solution. Last but not least, we present the Liouville property for generalized solution to the Navier-Stokes equations in R3 obeying certain restrictions.
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Convex hull properties for parabolic systems of partial differential equations
 Češík, Antonín ; Schwarzacher, Sebastian (advisor) ; Bulíček, Miroslav (referee)
The topic of this thesis is the convex hull property for systems of partial differential equations, which is a natural generalisation of the maximum principle for scalar equations. The main result of this thesis is a theorem asserting the convex hull property for the solutions of a certain class of parabolic systems of nonlinear partial differential equations. It also investigates the coefficients of linear systems. The respective results are sharp which is demonstrated by counterexamples to the convex hull property for solutions of linear elliptic and parabolic systems. The general theme is that the coupling of the system is what breaks the convex hull property, not necessarily the non-linearity.
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Topological entropy
 Češík, Antonín ; Vejnar, Benjamin (advisor) ; Pražák, Dalibor (referee)
In this thesis we study topological entropy as an invariant of topological dynamical systems. The first chapter contains basic definitions and examples of topological dynamical systems. In the second chapter we introduce the definition of topological entropy on a compact metric space. We study its properties, in particular the fact that it is invariant under conjugacy. The chapter concludes with calculation of topological entropy for the examples introduced in the first chapter. The last chapter deals with generalizing the notion of topological entropy to noncompact metric spaces. The case of piecewise affine maps on the real line is studied in more detail.
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