Principal Part

The principal part at of a function

is the portion of the Laurent series consisting of terms with negative degree. That is,

is the principal part of at . has an essential singularity at, if and only if the principal part is an infinite sum.

Famous quotes containing the words principal and/or part:

    Light, God’s eldest daughter, is a principal beauty in a building.
    Thomas Fuller (1608–1661)

    If man made himself the first object of study, he would see how incapable he is of going further. How can a part know the whole?
    Blaise Pascal (1623–1662)