imaginary number

imaginary number, any product of the form ai, in which a is a real number and i is the imaginary unit defined as Square root of√−1. See numerals and numeral systems.

This article was most recently revised and updated by William L. Hosch.
Citation Information
Article Title: imaginary number
Website Name: Encyclopaedia Britannica
Publisher: Encyclopaedia Britannica, Inc.
Date Published: 31 December 2024
Access Date: February 22, 2025