The study of the flows curves is one most fascinating research areas in differential geometry. In this paper, we investigate geometry timelike according to quasi-frame Minkowski space R2,1 (In refer these as “quasi-timelike curves”). We evolution quasi-timelike using velocity functions and obtain necessary sufficient conditions for inextensibility. Additionally, explicit forms time equations qu...

This is the first paper in a series to study vertex algebra-like objects arising from infinite-dimensional quantum groups (quantum affine algebras and Yangians). In this paper we lay a foundation for this study. We formulate and study notions of quasi module and S-quasi module for a G1-vertex algebra V , where S is a quantum Yang-Baxter operator on V . We also formulate and study a notion of qu...

VARIAN [1985] AND SCHWARTZ [1990] PROVED THAT, very generally, monopolistic third-degree price discrimination decreases aggregate welfare if total output falls (a conjecture which dates back to the work of A. C. Pigou, [1920]). In particular, these authors adopted a representative consumer approach (by assuming quasi-linear preferences) and used revealed-preference arguments. En passant, their ...

In this paper we introduce some stability criteria for impulsive fuzzy system of differential equations with finite delay in states. Firstly, a new comparison principle for fuzzy differential system compared to crisp ordinary differential equation, based on a notion of upper quasi-monotone nondecreasing, in N dimentional state space is presented. Furthermore, in order to analyze the stability o...

The X-ray observation of black hole candidates provides a valuable tool to probe regions very close to the central black hole, where strong-field relativistic effects become important. Recent studies have shown that these effects seem to manifest themselves in the observed X-ray spectrum, in terms of the shape of X-ray continuum and the profile of emission lines, and in the X-ray light curves, ...

In this paper, we classify quasi-conformally flat generalized Sasakian-space forms under the assumption that characteristic vector field is Killing. Also Weyl-symmetric forms.

Quasi-sparse eigenvector (QSE) diagonalization is a new computational method which finds approximate low-lying eigenvalues and eigenvectors for a general quantum field Hamiltonian H [1]. It handles the exponential increase in the dimension of Fock space by exploiting the sparsity of the Hamiltonian. The method is most effective when the splitting between low-lying eigenvalues is not too small c...

We give some new regularity conditions for Fenchel duality in separated locally convex vector spaces, written in terms of the notion of quasi interior and quasi-relative interior, respectively. We provide also an example of a convex optimization problem for which the classical generalized interior-point conditions given so far in the literature cannot be applied, while the one given by us is ap...

Let c : C → X×X be a correspondence with C and X quasi-projective schemes over an algebraically closed field k. We show that if u` : c ∗ 1Q` → c2Q` is an action defined by the localized Chern classes of a c2-perfect complex of vector bundles on C, where ` is a prime invertible in k, then the local terms of u` are given by the class of an algebraic cycle independent of `. We also prove some rela...

By assuming the existence of (quasi)-linear Regge trajectories for 25-plet mesons in the low energy region, we derive a new, 14th power, meson mass relation. This relation may be reduced to a quadratic Gell-Mann–Okubo type formula by fitting the values of the Regge slopes of these (quasi)-linear trajectories. Such a formula holds with an accuracy of ∼ 2% for vector mesons, and E-mail: BURAKOV@P...