From 2411362d9a000dd4cce81dec7421c0939d917650 Mon Sep 17 00:00:00 2001
From: "T. van der Sar" <t.vandersar@tudelft.nl>
Date: Sat, 6 Mar 2021 07:24:37 +0000
Subject: [PATCH] Update 8_many_atoms_solutions.md - typo fix

---
 src/8_many_atoms_solutions.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/8_many_atoms_solutions.md b/src/8_many_atoms_solutions.md
index 136d4067..3ab712c2 100644
--- a/src/8_many_atoms_solutions.md
+++ b/src/8_many_atoms_solutions.md
@@ -125,7 +125,7 @@ $$
 and for the effective mass we obtain
 
 $$
-m^*(k) = \mp \frac{\hbar^2}{a^2 t_1 t_2}\left[ \frac{t_1 t_2 \sin^2(ka)}{(t_1^2 + t_2^2 +2 t_1 t_2\cos(ka))^{3/2}} + \frac{\cos(ka)}{\sqrt{t_1^2 + t_2^2 +2 t_1 t_2\cos(ka)}}  \right]. 
+m^*(k) = \mp \frac{\hbar^2}{a^2 t_1 t_2}\left[ \frac{t_1 t_2 \sin^2(ka)}{(t_1^2 + t_2^2 +2 t_1 t_2\cos(ka))^{3/2}} + \frac{\cos(ka)}{\sqrt{t_1^2 + t_2^2 +2 t_1 t_2\cos(ka)}}  \right]^{-1}. 
 $$
 
 6.
-- 
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