Search Results - subject:"invariants"

Did you mean: subject:"invariant" (432 results)

Survey on testing technique for modern web application-rookies vantage point

Bharathi, M. Vijaya; Rodda, Sireesha - In: International journal of networking and virtual … 21 (2019) 2, pp. 277-288

Persistent link: https://www.econbiz.de/10012144473

Vector autoregressive moving average identification for macroeconomic modeling : a new methodology

Poskitt, Donald Stephen - In: Journal of econometrics 192 (2016) 2, pp. 468-484

Persistent link: https://www.econbiz.de/10011704730

One method of solution of an optimum investment portfolio problem for risky assets

Milnikov, Aleksander; Mamistvalov, Mikheil - In: IBSU Scientific Journal (IBSUSJ) 2 (2008) 1, pp. 66-70

The problem for choice of an optimum investment portfolio is considered. The square-law form of risk is presented as two-multiple convolution of covariant tensor of the covariance matrix and contravariant vector of weights. By means of reduction of covariance matrix to the diagonal form, the...

Persistent link: https://www.econbiz.de/10010280575

One Method of Solution of an Optimum Investment Portfolio Problem for Risky Assets

Milnikov, Alexander; Mamistvalov, Mikheil - In: IBSU Scientific Journal 2 (2008) 1, pp. 66-70

The problem for choice of an optimum investment portfolio is considered. The square-law form of risk is presented as two-multiple convolution of ковариантного tensor of the covariance matrix and kontravariant vector of weights. By means of reduction of covariance matrix to the...

Persistent link: https://www.econbiz.de/10008765814

Persistence intervals of fractals

Máté, Gabriell; Heermann, Dieter W. - In: Physica A: Statistical Mechanics and its Applications 405 (2014) C, pp. 252-259

Objects and structures presenting fractal like behavior are abundant in the world surrounding us. Fractal theory provides a great deal of tools for the analysis of the scaling properties of these objects. We would like to contribute to the field by analyzing and applying a particular case of the...

Persistent link: https://www.econbiz.de/10011060037

Some Results on the Identification and Estimation of Vector ARMAX Processes

Poskitt, D.S. - Department of Econometrics and Business Statistics, … - 2004

This paper addresses the problem of identifying echelon canonical forms for a vector autoregressive moving average model with exogenous variables using finite algorithms. For given values of the Kronecker indices a method for estimating the structural parameters of a model using ordinary least...

Persistent link: https://www.econbiz.de/10005581137

Conservation laws and invariants of motion for nonlinear internal waves: part II

Hamdi, Samir; Morse, Brian; Halphen, Bernard; … - In: Natural Hazards 57 (2011) 3, pp. 609-616

In this paper, we derive three conservation laws and three invariants of motion for the generalized Gardner equation … derivation of these conservation laws and their associated invariants of motion is direct and does not involve the use of … variational principles. It can be easily applied for finding similar invariants of motion for other general types of KdV, Gardner …

Persistent link: https://www.econbiz.de/10010846663

Finding behavior patterns and evaluating orderliness of dynamical systems by spanning tree invariants

Shieh, Jiunn-I; Wu, Hsin-Hung; Yang, Wei-Zu - In: Quality & Quantity: International Journal of Methodology 43 (2009) 6, pp. 1011-1023

Persistent link: https://www.econbiz.de/10009391255

Necessary conditions for the existence of quasi-polynomial invariants: the quasi-polynomial and Lotka–Volterra systems

Figueiredo, A.; Filho, T.M. Rocha; Brenig, L. - In: Physica A: Statistical Mechanics and its Applications 262 (1999) 1, pp. 158-180

decomposed in a simple manner. This decomposition permits to conclude that the existence of polynomial semi-invariants in Lotka …–Volterra systems is a necessary condition for the existence of quasi-polynomial invariants. We derive a method which allows to … construct the necessary conditions for existence of semi-invariants on Lotka–Volterra dynamical systems. Applications are given. …

Persistent link: https://www.econbiz.de/10010871993

Transformations of basic publication–citation matrices

Liang, Liming; Rousseau, Ronald - In: Journal of Informetrics 1 (2007) 3, pp. 249-255

transformations are highlighted together with some of their invariants. Such invariants offer a rigorous mathematically founded way of …

Persistent link: https://www.econbiz.de/10010795166