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### Charyyar Ashyralyyev

## Abstract

Reverse parabolic equation with integral condition is considered. Well-posedness of reverse parabolic problem in the Hölder space is proved. Coercive stability estimates for solution of three boundary value problems (BVPs) to reverse parabolic equation with integral condition are established.

### Gurupadavva Ingalahalli and C.S. Bagewadi

## Abstract

In this paper we study *ϕ*-recurrence *τ* -curvature tensor in (*k, µ*)-contact metric manifolds.

### Makhmud A. Sadybekov

## Abstract

In this paper, a new finite difference method to solve nonlocal boundary value problems for the heat equation is proposed. The most important feature of these problems is the non-self-adjointness. Because of the non-self-adjointness, major difficulties occur when applying analytical and numerical solution techniques. Moreover, problems with boundary conditions that do not possess strong regularity are less studied. The scope of the present paper is to justify possibility of building a stable difference scheme with weights for mentioned type of problems above.

### Jana Fialová

## Abstract

In this paper we derive a sequence from a movement of center of mass of arbitrary two planets in some solar system, where the planets circle on concentric circles in a same plane. A trajectory of center of mass of the planets is discussed. A sequence of points on the trajectory is chosen. Distances of the points to the origin are calculated and a distribution function of a sequence of the distances is found.

### Romi F. Shamoyan and Olivera R. Mihić

## Abstract

We consider and solve extremal problems in various bounded weakly pseudoconvex domains in ℂ* ^{n}* based on recent results on boundedness of Bergman projection with positive Bergman kernel in Bergman spaces

### Julien Roth

## Abstract

We prove that a closed convex hypersurface of the Euclidean space with almost constant anisotropic first and second mean curvatures in the *L ^{p}*-sense is

*W*

^{2}

*-close (up to rescaling and translations) to the Wulff shape. We also obtain characterizations of geodesic hyperspheres of space forms improving those of [10] and [11].*

^{,p}### Amir Baghban and Esmaeil Abedi

## Abstract

In this paper, the standard almost complex structure on the tangent bunle of a Riemannian manifold will be generalized. We will generalize the standard one to the new ones such that the induced (0, 2)-tensor on the tangent bundle using these structures and Liouville 1-form will be a Riemannian metric. Moreover, under the integrability condition, the curvature operator of the base manifold will be classified.

### Abderrahim Zagane and Mustapha Djaa

## Abstract

In this paper, we introduce the Mus-Sasaki metric on the tangent bundle *T M* as a new natural metric non-rigid on *T M*. First we investigate the geometry of the Mus-Sasakian metrics and we characterize the sectional curvature and the scalar curvature.

### Xiaoyuan Wang and Wenchang Chu

## Abstract

The *q*-derivative operator approach is illustrated by reviewing several typical summation formulae of terminating basic hypergeometric series.