From f1d1bfdc987f1b0703ec40ae02d99c1975abe03c Mon Sep 17 00:00:00 2001 From: Zoey Zheng Date: Mon, 29 Jun 2026 18:39:56 +1000 Subject: [PATCH] Define imaginary unit in complex numbers section Adds a brief definition of the imaginary unit. --- lectures/complex_and_trig.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lectures/complex_and_trig.md b/lectures/complex_and_trig.md index bdeb2ec4..002a888b 100644 --- a/lectures/complex_and_trig.md +++ b/lectures/complex_and_trig.md @@ -45,6 +45,8 @@ So let's dive in. A complex number has a **real part** $x$ and a purely **imaginary part** $y$. +Here, $i$ denotes the imaginary unit, satisfying $i^2 = -1$. + The Euclidean, polar, and trigonometric forms of a complex number $z$ are: $$