It is a series of complex integrals as shown below, denoted by version A.[br] A: Integration on a circle, B: Integration on a line/arc, C: Integration on any parametrized curve.[br]1. set the function using the valuable z[br]2.Click the Initialize button[br]3.Set options if necessary[br] magnify:magnifying ratio of the arrows of the function, r:radius, M: number of division[br][br]For further informaion please watch this Video.[br] https://www.youtube.com/playlist?list=PLmEX7-TmxuoI5UsSuDXffEOMlgKZ-ZXXg (Japanese)[br] https://studio.youtube.com/playlist/PLIyoE7qWZ48a41N3qDT2NNJRVD--qNlEj/edit (English)