Sobko V. Mathematical modeling of the mass transfer processes on the biorthogonal polynomials basis

The actual scientific problem – the development of adaptive analytical-numerical mathematical models of the mass transfer processe in particular gas motion in the pipelines and in the natural porous formations, which correspond to the practical tasks of the gas distribution optimization according to the criteria of rational consumption and the development of adaptive methods of calculation of these models which are oriented to use apriori information about the desired solutions, is solved. In this work, the quasi-spectral polynomials and the complete biorthogonal systems are constructed. Their properties are researched and expansions of biorthogonal Chebyshev polynomials of the first kind and their derivatives using quasi-spectral and biorthogonal functions are found; as well as Fourier-Chebyshev series representations using biorthogonal expansions are obtained.