From e33ccfabfd15e5b37538e92fe7883be90ae5273f Mon Sep 17 00:00:00 2001
From: "T. van der Sar" <t.vandersar@tudelft.nl>
Date: Fri, 12 Apr 2024 03:23:09 +0000
Subject: [PATCH] Update 7_tight_binding.md - typo fix

---
 docs/7_tight_binding.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/7_tight_binding.md b/docs/7_tight_binding.md
index ae98626..e73cc83 100644
--- a/docs/7_tight_binding.md
+++ b/docs/7_tight_binding.md
@@ -354,7 +354,7 @@ $$ E = E_0 - 2t \cos(ka), $$
 we get
 
 $$
-ka = \pm\arccos[(E - E_0) / 2t],
+ka = \pm\arccos[-(E - E_0) / 2t],
 $$
 
 and
-- 
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