From 8ca431dc5e876aa24024985ad4eec1c66c8cc360 Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Thu, 24 Sep 2026 11:17:36 +0200
Subject: Improve knowledge base

---
 source/know/concept/kubo-formula/index.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'source/know/concept/kubo-formula')

diff --git a/source/know/concept/kubo-formula/index.md b/source/know/concept/kubo-formula/index.md
index 41fda3c..774ddf7 100644
--- a/source/know/concept/kubo-formula/index.md
+++ b/source/know/concept/kubo-formula/index.md
@@ -105,7 +105,7 @@ Where we have defined the **retarded correlation function** $$C^R_{A H_1}(t, t')
 $$\begin{aligned}
     \boxed{
         C^R_{A H_1}(t, t')
-        \equiv - \frac{i}{\hbar} \Theta(t \!-\! t') \Expval{\Comm{\hat{A}_I(t)}{\hat{H}_{1,I}(t')}}_0
+        \equiv - \frac{i}{\hbar} \Theta(t - t') \Expval{\Comm{\hat{A}_I(t)}{\hat{H}_{1,I}(t')}}_0
     }
 \end{aligned}$$
 
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