From 0bd5cca86d5f7195766f598f3161f2181dc511fa Mon Sep 17 00:00:00 2001
From: Iacopo Bertelli <bertelli.iacopo@gmail.com>
Date: Fri, 18 Jan 2019 18:15:56 +0000
Subject: [PATCH] Fixes

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

diff --git a/src/2_debye_model.md b/src/2_debye_model.md
index ef0df4b..ae69110 100644
--- a/src/2_debye_model.md
+++ b/src/2_debye_model.md
@@ -132,7 +132,7 @@ draw_classic_axes(ax, xlabeloffset=0.3)
 ## Exercises
 
 ### Exercise 1: Debye model: concepts
-1. Describe the concepts of k-space. What momenta are allowed in a 2D system of dimensions LxL?
+1. Describe the concept of k-space. What momenta are allowed in a 2D system of dimensions $L^2$?
 2. The probability to find an atom of a 1D solid that originally had a position $x$ at a displacement $\delta x$ is shown on this plot:
 
 ```python
-- 
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