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:

    “God should not be called an individual substance, since the principal of individuation is matter.”
    —Thomas Aquinas (c. 1225–1274)

    “Oh, some as soon would throw it all
    As throw a part away.
    And some will say all sorts of things,
    But some mean what they say.”
    —Robert Frost (1874–1963)