В даппой работе получена рекуррентная формула для сечений производящих рядов числа путей па целочисленной решетке и доказано, что сечения производящей функции для решеточных путей являются рациональными функциями (аналог теоремы Муавра).
In this paper, we study the sections of the generating series for solutions to a linear multidimensional difference equation with constant coefficients and find recurrent relations for these sections. As a consequence, a multidimensional analogue of Moivre's theorem on the rationality of sections of the generating series depending on the form of the initial data of the Cauchy problem for a multidimensional difference equation is proved. For problems on the number of paths on an integer lattice, it is shown that the sections of their generating series represent the well-known sequences of polynomials (Fibonacci, Pell, etc.) with a suitable choice of steps.
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