the rank-k numerical range has a close connection to the construction of quantum error correction code for a noisy quantum channel. for noisy quantum channel, a quantum error correcting code of dimension k exists if and only if the associated joint rank-k numerical range is non-empty. in this paper the notion of joint rank-k numerical range is generalized and some statements of [2011, generaliz...

Frequency-dependent correlations, such as the spectral function and the dynamical structure factor, help illustrate condensed matter experiments. Within the density matrix renormalization group (DMRG) framework, an accurate method for calculating spectral functions directly in frequency is the correction-vector method. The correction vector can be computed by solving a linear equation or by min...

An empirical study of peach supply response to own-price and yield in Colombia using time series data from 2000 2018 was undertaken. A quantitative, correlational non-experimental research design selected the Johansen´s co-integration as well vector error correction framework were employed. The Augmented Dickey-Fuller test showed that integrated order one confirmed existence a long-term relatio...

This study examined the effect of external debt burden on growth Nigeria economy. Time series data was sourced from Central Bank Statistical Bulletin 1986-2019. real gross domestic proxied for dependent variable while servicing; stock, overhang, sustainability and crowd-out were proxies independent variables. The employed multiple regression models to estimate relationship that exists between i...

The research was conducted on the topic: Defense Budget and Response of Foreign Direct Investment (FDI) in Nigeria: Co-integration Vector Error Correction Model (VECM) Approach. It investigated how move response to defence budget considering insecurity problem faced by Nigeria during period study. Time series data which spanned from 1981 2019 sourced CBN. collected subjected unit root test, co-...