Researchers around the globe defined many approaches to defining them, and give their various recommendations to using uncertainty theory. There are several literaturestudiesthatclassify some basic uncertain parameters. It should be noted that there is no unique reorientation of the uncertain parameter. ...
Coronavirus disease 2019 (COVID-19) occurred in Wuhan and rapidly spread around the world. Assessing the impact of COVID-19 is the first and foremost concern. The inflection point (IP) and the corresponding cumulative number of infected cases (CNICs) are the two viewpoints that should be joi...