This diploma thesis will mostly focus on the problem of convergence of the complex power series. There is a maximum open disk for the power series, which the series converges, however, it is much more complicated to under- stand the convergence at boundary points of this disk and to determine at which points of the boundary has the series has a local holomorphic exten- sion. This thesis includes some interesting examples of the power series on a complex disk and some detailed description of a convergence at boundary points of the disk. For better understanding of the convergence at boundary points, we used and prove Abel’s theorem.
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