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:
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“Two may talk and one may hear, but three cannot take part in a conversation of the most sincere and searching sort. In good company there is never such discourse between two, across the table, as takes place when you leave them open.”
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