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)

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    —Blaise Pascal (1623–1662)