Keywords mathematical line graph, statistical graphs, variables, distance, time, ordered pairs, linear relationship, first-degree equations, coordinate axes, constant terms, coefficients Email us ...

Determining the chromatic number is an NP-hard problem in general, yet research has made substantial inroads by focusing on specific graph classes defined by restrictions, such as the exclusion of ...

In this paper, we study the least squares (LS) estimator in a linear panel regression model with unknown number of factors appearing as interactive fixed effects. Assuming that the number of factors ...