From 0d97f24acad7e5a7b14e055970b785f137a6beb8 Mon Sep 17 00:00:00 2001
From: Matthieu Schaller <matthieu.schaller@durham.ac.uk>
Date: Mon, 26 Feb 2018 17:26:07 +0000
Subject: [PATCH] Better notation for \mu_ij term in the cosmology notes.

---
 theory/Cosmology/coordinates.tex | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/theory/Cosmology/coordinates.tex b/theory/Cosmology/coordinates.tex
index 52ab8ddb9a..56354623ea 100644
--- a/theory/Cosmology/coordinates.tex
+++ b/theory/Cosmology/coordinates.tex
@@ -109,8 +109,8 @@ viscosity ``tensor'' $\Pi_{ij} \equiv \frac{1}{2}\alpha_{\rm visc} v_{\rm
   \omega_{ij}' &= \left(\mathbf{v}_i' - \mathbf{v}_j'\right) \cdot
   \left(\mathbf{r}_i' - \mathbf{r}_j'\right), \\
   \mu_{ij}' &=
-  a^{(3\gamma-5)/2} \left(\omega_{ij}' + a^2H\left(\mathbf{r}_i' -
-  \mathbf{r}_j'\right)^2 \right) / |\mathbf{r}_i' - \mathbf{r}_j' |,
+  a^{(3\gamma-5)/2} \left(\omega_{ij}' + a^2H\left|\mathbf{r}_i' -
+  \mathbf{r}_j'\right|^2 \right) / |\mathbf{r}_i' - \mathbf{r}_j' |,
   \\
   v_{\rm sig}' &= c_i' + c_j' - 3 \mu_{ij}'.
 \end{align}
-- 
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