等比级数的推广

The Generalization of The Geometric Series

定义了双等比数列及ｍ等比数列，并导出了它们的通项公式和前ｎ项和公式。然后定义了双等比级数及ｍ等比级数，解决了它们的敛散性问题。

Double geometric number sequence and m geometric number sequenceare defined and their formulas of general term and partial sums of first n term aregiven.Double geometric series and m geometric series are defined and their convergenceand divergence problems are solved.