A residue is a special type of contour integral of a function of this type, and a formula for integrating this type of function is named for Cauchy.
A residue is a special type of contour integral of a function of this type, and a formula for integrating this type of function is named for Cauchy. William Hamilton extended this type of value to a system called quaternions. De Moivre's formula deals with exponentiation of these values, and Euler's equation expresses the exponential of one of these in terms of sine and cosine. For 10 points, identify this type of number which has a part that can be expressed as the square root of negative one.
A residue is a special type of contour integral of a function of this type, and a formula for integrating this type of function is named for Cauchy.
{complex} [or {imaginary}]