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)
“In the learned journal, in the influential newspaper, I discern no form; only some irresponsible shadow; oftener some monied corporation, or some dangler, who hopes, in the mask and robes of his paragraph, to pass for somebody. But through every clause and part of speech of the right book I meet the eyes of the most determined men; his force and terror inundate every word: the commas and dashes are alive; so that the writing is athletic and nimble,—can go far and live long.”
—Ralph Waldo Emerson (1803–1882)