The SPIN extension presented in this article is meant as a way to facilitate the modeling and verification of object-oriented programs. It provides means for the formal representation of some run-time mechanisms intensively used in OO software, such as dynamic object creation and deletion, virtual function calls, etc. This article presents a number of language extensions along with their implem...

In this paper, a three-parameter lifetime distribution named power Hamza (PH) is proposed. The PH useful generalization of the which accommodates heavy-tailed, upside-down bathtub and J-shaped hazard rates making it more flexible than for modelling various kinds data. A comprehensive account properties presented. maximum likelihood estimators unknown model parameters are discussed. Finally, rea...