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)

    “I do not correct my first imaginings by my second—well, yes, perhaps a word or so, but only to vary, not to delete. I want to represent the course of my humors and I want people to see each part at its birth.”
    —Michel de Montaigne (1533–1592)