Difference Equation

Mathematical equality involving the differences between successive values of a function of a discrete variable. A discrete variable is one that is defined or of interest only for values that differ by some finite amount, usually a constant and often 1; for example, the discrete variable x may have the values x0 = a, x1 = a 1, x2 = a 2, . . . , xn = a n. The function y has the corresponding values y0, y1, y2, . . . , yn, from which the