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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 75
Millerová, Miroslava , Miret, Josep M. , Sillasen, Anita A.
On digraphs of excess one

A digraph in which, for every pair of vertices u and v (not necessarily distinct), there is at most one walk of length at most k from u to v is called a k-geodetic digraph. The order N(d,k) of a k-geodetic digraph of minimum out-degree d is at least th...

Tomášová, Petra , Čermáková, Martina , Pelantová, Helena , Vecka, Marek , Kratochvílová, Helena , Lipš, Michal , Lindner, Jaroslav , Šedivá, Blanka , Haluzík, Martin , Kuzma, Marek
Minor lipids profiling in subcutaneous and epicardial fat tissue using LC/MS with an optimized preanalytical phase

Analysis of bioactive lipids in adipose tissue could lead to better understanding of the pathogenesis of obesity and its complications. However, current MS methods are limited by a high content of triacylglycerols (TAGs), which markedly surpasses the amount of other lipids and suppresse...

Stehlík, Petr , Volek, Jonáš
Nonuniqueness of implicit lattice Nagumo equation

We consider the implicit discretization of Nagumo equation on finite lattices and show that its variational formulation corresponds in various parameter settings to convex, mountain-pass or saddle-point geometries. Consequently, we are able to derive conditions under which the implicit discretization&...

Cibulka, Radek , Fabian, Marián , Kruger, Alexander Y.
On semiregularity of mappings

There are two basic ways of weakening the definition of the well-known metric regularity property by fixing one of the points involved in the definition. The first resulting property is called metric subregularity and has attracted a lot of attention during the last decades. O...

Franta, Michal , Libich, Jan , Stehlík, Petr
Tracking Monetary-Fiscal Interactions across Time and Space

The long-term fiscal outlook of most high-income countries is grim. Should independent central bankers be afraid of an unpleasant monetarist arithmetic, i.e., fiscal imbalances spilling over to monetary policy and jeopardizing price stability? To provide some insights, this paper tracks the ...

Brause, Christoph , Holub, Přemysl , Kabela, Adam , Ryjáček, Zdeněk , Schiermeyer, Ingo , Vrána, Petr
On forbidden induced subgraphs for K(1,3)-free perfect graphs

We study {K(1,3),Y}-free graphs, and show that the following three statements are equivalent: (1) every connected {K(1,3),Y}-free graph which is distinct from an odd cycle and which has independence number at least 3 is perfect; (2) every connected {K(1,3),Y}-free graph which is distinc...

Eshagh, Mehdi , Pitoňák, Martin
Elastic Thickness Determination from on-orbit GOCE Data and CRUST1.0

Elastic thickness (Te) is a parameter representing the lithospheric strength with respect to the loading. Those places, having large values of elastic thickness, flexes less. In this paper, the on-orbit measured gravitational gradients of the Gravity field and steady-state Ocean Circulation ...

Eshagh, Mehdi , Pitoňák, Martin , Tenzer, Robert
Lithosperic elastic thickness estimates in central Eurasia

We estimate the elastic thickness of a continental lithosphere by using two approaches that combine the Vening Meinesz-Moritz (VMM) regional isostatic principle with isostatic flexure models formulated based on solving flexural differential equations for a thin elastic shell with and without ...

Wang, Naer , Nedela, Roman , Hu, Kan
Regular dessigns uniquelly determined by a nilpotent automorphism group

In this paper we consider the classification of uniquelly regular Grothendick dessins with nilpotent automorphism groups. The problem is reduced to the classification of finite maximally automorphic p-groups.

Epperlein, Jeremias , Švígler, Vladimír
On Arbitrarily Long Periodic Orbits of Evolutionary Games on Graphs

A periodic behavior is a well observed phenomena in biological and economical systems. We show that evolutionary games on graphs with imitation dynamics can display periodic behavior for an arbitrary choice of game theoretical parameters describing social-dilemma games. We construct graphs a...

Bobkov, Vladimír , Mieko, Tanaka
On sign-changing solutions for (p, q)-Laplace equations with two parameters

We investigate the existence of nodal (sign-changing) solutions to the Dirichlet problem for a two-parametric family of partially homogeneous (p, q)-Laplace equations −Δpu − Δqu = α|u|p−2u + β|u|q−2u where p ≠ q. By virtue of the Nehari manifolds, the linking theorem, and descendi...

Slavík, Antonín , Stehlík, Petr , Volek, Jonáš
Well-posedness and maximum principles for lattice reaction-diffusion equations

Existence, uniqueness and continuous dependence results together with maximum principles represent key tools in the analysis of lattice reaction-diffusion equations. In this paper, we study these questions in full generality by considering nonautonomous reaction functions, possibly nonsymmetric diffusion a...

Jirková, Veronika , Böhmová, Hana , Marek, Patrice
Airway dimension and orthodontic treatment of distoocclusion

The presented study evaluates the ways in which an extraction or non-extraction orthodontic treatment of distoocclusion in growing patients may affect selected skeletal and dental parameters and anteroposterior dimension of airways in the area of oropharynx as represented in the cephalogram, ...

Drábek, Pavel , Takáč, Peter
Convergence to travelling waves in Fisher’s population genetics model with a non-Lipschitzian reaction term

We consider the Fisher equation for advance of advatageous gene with non-Lipschitzian reaction term. We prove new travelling wave profiles and the convergence of the Cauchy problem to one of those profiles.

Kašparová, Martina , Honzík, Lukáš , Hora, Jaroslav , Pěchoučková, Šárka
Maturita z matematiky v Bavorsku - zadání úloh a stručný postup řešení. Část 1

The article presents the tasks of a mathematic school leaving examination at Bavarian high schools in May 2017. This tasks are supplemented by brief descriptions of the solutions.

Tomiczek, Petr
Forced duffing equation with a non-strictly monotonic potential

This article is devoted to study the existence of a solution to the periodic nonlinear second order ordinary differential equation with damping u''(x)+ c u'(x)+g(x,u)=f(x) x in [0,T] , u(0)=u(T), u'(0)=u'(T), where c in R, g is a Carath'eodory function, f in L^1(...

Ryjáček, Zdeněk , Vrána, Petr , Wang, Shipeng
Closure for {K(1,4),K(1,4)+e}-free graphs

We introduce a closure concept for hamiltonicity in the class of {K(1,4),K(1,4)+e}-free graphs, extending the closure for claw-free graphs introduced by Ryjáček (1997). The closure of a {K(1,4),K(1,4)+e}-free graph G with minimum degree at least 6 is uniquely determined, is a line graph...

Looseová, Iveta , Nečesal, Petr
The Fucik spectrum of the discrete Dirichlet operator

In this paper, we deal with the discrete Dirichlet operator of the second order and we investigate its Fučík spectrum, which consists of a finite number of algebraic curves. For each non-trivial Fučík curve, we are able to detect a finite number of its points, which ...

Vršek, Jan
Contour curves and isophotes on rational ruled surfaces

Ruled surfaces, i.e., surfaces generated by a one-parametric set of lines, are widely used in the field of applied geometry. An isophote on a surface is a curve consisting of those surface points whose normals form a constant angle with a fixed vector. Choosing the angle&...

Bobkov, Vladimír , Tanaka, Mieko
On sign-changing solutions for resonant (p,q)-Laplace equations

We provide two existence results for sign-changing solutions to the Dirichlet problem for the family of equations $-\Delta_p u -\Delta_q u = \alpha |u|^{p-2}u + \beta |u|^{q-2}u$, where $1<q<p$ and $\alpha$, $\beta$ are parameters. First, we show the existence in&#x...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 75