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## Main Question or Discussion Point

I'm a little confused about integration with complex variables.

Are there two types of integrals?:

1. Integrands with complex numbers but the variable of integration is real.

2. Intregands with complex numbers and the variable of integration is also complex.

But can't (2.) be made into (1.) by dz = dx + i dy...you then have two integrations over real numbers...?

Are there two types of integrals?:

1. Integrands with complex numbers but the variable of integration is real.

2. Intregands with complex numbers and the variable of integration is also complex.

But can't (2.) be made into (1.) by dz = dx + i dy...you then have two integrations over real numbers...?