---
tag: 0TZ2DPT0JV
kind: concept
name: Principal part
aliases: [principal-part-of-a-laurent-series, singular-part]
msc: [30B10]
sources:
  - url: https://en.wikipedia.org/wiki/Principal_part
    locator: lead section
same_as:
  wikidata: Q7245087
  wikipedia: Principal part
---

## Summary

The principal part of a function at an isolated singularity is the part of its Laurent series with the negative powers, see the [[definition|0NDV5R6Z6X]].