The two-dimensional -fraction with independent variables for double power series

Abstract: In this paper the two-dimensional -fraction with independent variables which is the generalization of the continued -fraction is considered. The correspondence between the formal double power series and the above mentioned fraction is studied. As a result the algorithm for the expansion of the formal double power series into the corresponding two-dimensional -fraction with independent variables has been constructed and the conditions for the existence of such an algorithm have been established. The expansion of some functions into the corresponding two-dimensional -fraction with independent variables is constructed and the efficiency of the obtained expansion by using approximants is shown. [Copyright &y& Elsevier]