When is the sum of series equal to the sum of grades?
When there are infinite poles, the series is equal to the sum of fractional times. The sum of series refers to a series in which the ratio of each term to its previous term is equal to the same constant from the second term, usually expressed by G and P. This constant is called the common ratio of geometric series, usually expressed by the letter Q (q≠0), and the geometric series is a 1≠0. Where each item in {an} is not 0. Sum of power series, when the numerator is less than or equal to the denominator, we need to discuss 0 and power series, which is one of the important concepts in mathematical analysis. Every item in the exponential column is the power of (x-a) corresponding to the serial number n of the series item (n is an integer counting from 0, and a is a constant). Power series is an important concept in mathematical analysis, which has been used as a basic content in many fields such as real variable function and complex variable function.