From 075683cdf4588fe16f41d9f7b46b9720b42b2553 Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Wed, 17 Jul 2024 10:01:43 +0200
Subject: Improve knowledge base

---
 source/know/concept/lyddane-sachs-teller-relation/index.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'source/know/concept/lyddane-sachs-teller-relation/index.md')

diff --git a/source/know/concept/lyddane-sachs-teller-relation/index.md b/source/know/concept/lyddane-sachs-teller-relation/index.md
index e80bf00..9cec9dc 100644
--- a/source/know/concept/lyddane-sachs-teller-relation/index.md
+++ b/source/know/concept/lyddane-sachs-teller-relation/index.md
@@ -219,8 +219,8 @@ i.e. the material becomes a perfect reflector:
 
 $$\begin{aligned}
     R
-    = \bigg| \frac{i \sqrt{|\varepsilon_r|} - 1}{i \sqrt{|\varepsilon_r|} + 1} \bigg|^2
-    = \frac{|\varepsilon_r|^2 + 1^2}{|\varepsilon_r|^2 + 1^2}
+    = \bigg| \frac{i \sqrt{-\varepsilon_r} - 1}{i \sqrt{-\varepsilon_r} + 1} \bigg|^2
+    = \frac{\varepsilon_r^2 + 1^2}{\varepsilon_r^2 + 1^2}
     = 1
 \end{aligned}$$
 
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