It is a series of complex integrals as shown below, denoted by version C.[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, such as f(z)=z^2[br]2. set the path using Sequence command. Number of section must be less than 10. [br](If your curve has more than 2 sections, be awear that the end point of one section and the start point of the next section are different)[br]In each section, parametetric curve must be a set of complex numbers using Sequence command.[br]For example , Sequence(t^2+0 i ,t,0,1,delta) is acceptable. Sequence(t^2 ,t,0,1,delta) is NOT.[br]3. Click the Initialize button[br]4.Set options if necessary[br] magnify:magnifying ratio of the arrows of the function, delta:division interval [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)