A matrix A is said to have signed null space provided there exists a set S of sign patterns such that the set of sign patterns of vectors in the null space of à is S for each Ã∈Q(A). It is a generalization of a number of important qualitative matrix classes such as L-matrices, S∗-matrices, totally L-matrices, etc. In this paper, we obtain some new characterizations for matrices with signed null...

We study the circular motion of charged particles near a black hole. The general form Lyapunov exponent is obtained by using Jacobian matrix. results show that chaos bound can be saturated on horizon. By further expanding horizon and investigating Reissner-Nordstr\"om(RN) holes with different $M/Q$, we find in contrast to static equilibrium, have larger due existence angular momentum. For RN wh...

In the paradigm of effective field theory, one hierarchically obtains action Aeff[q,⋯] for some low(er) energy degrees freedom q, by integrating out high(er) ξ, in a path integral, based on an A[q,ξ,⋯]. We show how can integrate vector va A[Γ,v,⋯] and obtain Aeff[Γ,⋯] which, variation with respect to connection Γ, leads Einstein's equations metric compatible connection. The derivation predicts ...

The linear step-up multiple testing procedure controls the False Discovery Rate (FDR) at the desired level q for independent and positively dependent test statistics. When all null hypotheses are true, and the test statistics are independent and continuous, the bound is sharp. When some of the null hypotheses are not true, the procedure is conservative by a factor which is the proportion m0/m o...

this paper aims to evaluate inventory cost of a two-echelon serial supply chain system under vendor managed inventory program with stochastic demand, and examine the effect of environmental factors on the cost of overall system. for this purpose, we consider a two-echelon serial supply chain with a manufacturer and a retailer. under vendor managed inventory program, the decision on inventory le...

E. Cartan’s method of moving frames is applied to 3-dimensional manifolds M which are CR-embedded in 5-dimensional real hyperquadrics Q order classify up CR symmetries given by the action one Lie groups SU(3,1) or SU(2,2). In latter case, structure derives from a shear-free null geodesic congruence on Minkowski spacetime, and relationship relativity discussed. both cases, we compute homogeneous...

We present evidence that the acoustic component of the strut display of male sage grouse Centrocercus urophasianus is highly directional and that the nature of this directionality is unique among measured vertebrates. Where vertebrate acoustic signals have been found to be directional, they are most intense anteriorly and are bilaterally symmetrical. Our results show that sage grouse acoustic r...

In this paper we first consider the null-plane bound-state equation for a q ¯ q pair in 1+3 dimensions and in the lowest-order Tamm-Dancoff approximation. Light-cone gauge is chosen with a causal prescription for the gauge pole in the propagator. Then we show that this equation, when dimensionally reduced to 1+1 dimensions, becomes 't Hooft's bound-state equation, which is characterized by an x...

Casimir energy is always suggested as a possible source to create traversable wormhole. It also used demonstrate the existence of negative energy, which can be created in lab. To generalize this idea, Yukawa modification has been considered Remo Garattini (Eur. Phys. J. C 81 no.9, 824, 2021). In work, we explore Yukawa–Casimir wormholes symmetric teleparallel gravity. We have taken four differe...

We introduce an ordinal index which measures the complexity of a weakly null sequence, and show that a construction due to J. Schreier can be iterated to produce for each α < ω1, a weakly null sequence (xαn)n in C ( ωω α ) with complexity α. As in the Schreier example each of these is a sequence of indicator functions which is a suppression-1 unconditional basic sequence. These sequences are us...