HP 15c - Manual (Page 137)

Section 11: Calculating With Complex Numbers 137
For Further Information
The HP-15C Advanced Functions Handbook presents more detailed and
technical aspects of using complex numbers in various functions with the
HP-15C. Applications are included. The topics include:

Accuracy considerations.

Principal branches of multi-valued functions.

Complex contour integrals.

Complex potentials.

Storing and recalling complex numbers using a matrix.

Calculating the nth roots of a complex number.

Solving an equation for its complex roots.

Using _ and f in Complex mode.