---
tag: 0W8QHVSN95
kind: concept
name: Branch cut
aliases: [cut]
msc: [30A99]
sources:
  - url: https://en.wikipedia.org/wiki/Branch_point
    locator: Branch cuts
---

## Summary

A branch cut is a curve that is removed from the plane so that a multivalued function has a continuous single-valued branch on the rest. See the [[definition|06JYC06JHY]].
The usual branch cut for the logarithm is the negative real axis.