Saturation problems for positive linear approximation of function in quasi normed spaces

Many authors work on constrained approximation such as monotonicity, convexity and k monotoni city, but little works introduced in positive collinear approximation. The aim of our paper is to investigate linear and positive approximation for real functions in , saturation problem between degree of best positive and linear approximation, and find collinear positive best approximation for measurable function in    Lebesgue quasi normed spaces