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.
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—John Ruskin (1819–1900)
“Taft, laughing, “What troubles [brother] Charles is, he is afraid Roosevelt will get the credit of making me President and not himself.” To Charles: “I will agree not to minimize the part you played in making me President if you will agree not to minimize the part Roosevelt played.””
—William Howard Taft (1857–1930)