Investors use different approaches to select optimal portfolio. so, Optimal investment choices according to return can be interpreted in different models. The traditional approach to allocate portfolio selection called a mean - variance explains. Another approach is Markov chain. Markov chain is a random process without memory. This means that the conditional probability distribution of the nex...

To deal with environmental uncertainty, organizations need resilience to respond disruptions, such as changing market conditions or variations in demand supply, while avoiding large scale adjustments. The concept of is ambiguous, often explained the capability an organization a supply chain recover its original state, within appropriate time frame, after being disrupted. Resilient chains have e...

We consider the dressed energy $\varepsilon$ of XXZ chain in massless antiferromagnetic parameter regime at $0 < \Delta 1$ and finite magnetic field. This function is defined as a solution Fredholm integral equation second kind. Conceived real over numbers it describes particle-hole excitations ground state fixed The extension to complex plane determines solutions Bethe Ansatz equations for eig...