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## Orbit Decidability, Applications and Variations

### Extended Abstracts Fall 2012 (2014-01-01): 1 , January 01, 2014

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## Block SSOR preconditionings for high order 3d fe systems

### BIT (1989-12-01) 29: 805-823 , December 01, 1989

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For solving 3D high order hierarchical FE systems the block SSOR preconditioned CG algorithms based on new stripwise block two-color orderings of degrees of freedom and providing for efficient concurrent/vector implementation are suggested. As demonstrated by numerical results for the 3D Navier equations approximated using hierarchical order*p*, 2 ≤*p* ≤ 5, FE's the convergence rate of such BSSOR-CG algorithms is only slightly dependent on*p* and mesh nonunformity.

## Biharmonic Maps

### Developments of Harmonic Maps, Wave Maps and Yang-Mills Fields into Biharmonic Maps, Biwave Maps and Bi-Yang-Mills Fields (2013-01-01): 243-304 , January 01, 2013

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The last five decades have witnessed many developments in the theory of harmonic maps. To become acquainted to some of these, the reader is referred to two reports and a survey paper by Eells and Lemaire [119, 122, 124] about the developments of harmonic maps up to 1988 for details. Several books on harmonic maps [203, 205, 206, 389, 425] are also available. In this chapter, we follow the notions and notations of harmonic maps between Riemannian manifolds by Eells- Sampson [129] in the introduction.We discuss the crucial topics in harmonic maps including fundamentals, regularity, maps of surfaces, maps of KRahler manifolds, maps into groups and Grassmannians, harmonic maps, loop groups, and integrable systems, harmonicmorphisms, maps of singular spaces, and transversally harmonic maps. Since the theory of harmonic maps has been developed over half a century, it is impossible to provide full details. However, we try to present the most important components of the topics.

## Large Deviations for Multivalued Stochastic Differential Equations

### Journal of Theoretical Probability (2010-10-27) 23: 1142-1156 , October 27, 2010

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We prove a large deviation principle of Freidlin–Wentzell type for multivalued stochastic differential equations with monotone drifts that in particular contain a class of SDEs with reflection in a convex domain.

## Singular Integrals on Product Homogeneous Groups

### Integral Equations and Operator Theory (2013-05-01) 76: 55-79 , May 01, 2013

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We consider singular integral operators with rough kernels on the product space of homogeneous groups. We prove *L*^{p} boundedness of them for
$${p \in (1,\infty)}$$
under a sharp integrability condition of the kernels.

## Nonself-similar flow with a shock wave reflected from the center of symmetry and new self-similar solutions with two reflected shocks

### Computational Mathematics and Mathematical Physics (2013-03-01) 53: 350-368 , March 01, 2013

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In some problems concerning cylindrically and spherically symmetric unsteady ideal (inviscid and nonheat-conducting) gas flows at the axis and center of symmetry (hereafter, at the center of symmetry), the gas density vanishes and the speed of sound becomes infinite starting at some time. This situation occurs in the problem of a shock wave reflecting from the center of symmetry. For an ideal gas with constant heat capacities and their ratio γ (adiabatic exponent), the solution of this problem near the reflection point is self-similar with a self-similarity exponent determined in the course of the solution construction. Assuming that γ on the reflected shock wave decreases, if this decrease exceeds a threshold value, the flow changes substantially. Assuming that the type of the solution remains unchanged for such γ, self-similarity is preserved if a piston starts expanding from the center of symmetry at the reflection time preceded by a finite-intensity reflected shock wave propagating at the speed of sound. To answer some questions arising in this formulation, specifically, to find the solution in the absence of the piston, the evolution of a close-to-self-similar solution calculated by the method of characteristics is traced. The required modification of the method of characteristics and the results obtained with it are described. The numerical results reveal a number of unexpected features. As a result, new self-similar solutions are constructed in which two (rather than one) shock waves reflect from the center of symmetry in the absence of the piston.

## A multi-grid method for variational inequalities in contact problems

### Computing (1993-09-01) 51: 293-311 , September 01, 1993

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The convergence of the method is proved and it is shown that the objective function corresponding to the quadratic programming problem is monotonically decreasing. The results of numerical tests for an elasticity contact problem are presented.

## On the representation of substitutions as products of a transposition and a full cycle

### Journal of Mathematical Sciences (2010-05-04) 166: 710-724 , May 04, 2010

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A method of solving equations of the form
$ {g^{{y_1}}} \cdot h \cdot {g^{{y_2}}} \cdot h \cdot \ldots \cdot {g^{{y_1}}} \cdot h \cdot {g^{{y_{l + 1}}}} = \sigma $
in the symmetric group S_{n} is proposed, where *h* is a transposition, *g* is a full cycle, and *σ* × S_{n}. The method is based on building all sets of generalized inversions of the bottom line of the substitution *σ* by means of a system of Boolean equations associated with *σ*. An example of solving an equation in a group S_{6} is given.

## Super-high-frequency oscillations in a discontinuous dynamic system with time delay

### Israel Journal of Mathematics (1995-10-01) 90: 199-219 , October 01, 1995

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We study oscillations in the discontinuous dynamic system with time delay
$$\dot x(t) = - sign x(t - 1) + F(x(t),t), t \geqslant 0$$
. This is a typical model of relay feedback with delay. It is known that stable modes in this system have a bounded oscillation frequency. Here we consider transient processes and obtain the following result: under some restrictions of*F*, the average oscillation frequency of any solution becomes finite after a period of time, i.e. super-high-frequency oscillations (with infinite frequency) exist only in a finite time interval. Moreover, we give an effective upper bound on the length of this interval.

## An Internal Transition Layer in a Linear Optimal Control Problem

### Differential Equations (2001-03-01) 37: 332-345 , March 01, 2001

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