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-rw-r--r--source/know/concept/alfven-waves/index.md6
1 files changed, 3 insertions, 3 deletions
diff --git a/source/know/concept/alfven-waves/index.md b/source/know/concept/alfven-waves/index.md
index 31576f3..0396c7a 100644
--- a/source/know/concept/alfven-waves/index.md
+++ b/source/know/concept/alfven-waves/index.md
@@ -61,12 +61,12 @@ $$\begin{aligned}
= \frac{1}{\mu_0} \nabla \cross \vb{B}_1
\end{aligned}$$
-Substituting this into the momentum equation,
+Substituting this into the above momentum equation,
and differentiating with respect to $$t$$:
$$\begin{aligned}
\rho \pdvn{2}{\vb{u}_1}{t}
- = \frac{1}{\mu_0} \bigg( \Big( \nabla \cross \pdv{}{\vb{B}1}{t} \Big) \cross \vb{B}_0 \bigg)
+ = \frac{1}{\mu_0} \bigg( \Big( \nabla \cross \pdv{\vb{B}_1}{t} \Big) \cross \vb{B}_0 \bigg)
\end{aligned}$$
For which we can use Faraday's law to rewrite $$\ipdv{\vb{B}_1}{t}$$,
@@ -78,7 +78,7 @@ $$\begin{aligned}
= \nabla \cross (\vb{u}_1 \cross \vb{B}_0)
\end{aligned}$$
-Inserting this into the momentum equation for $$\vb{u}_1$$
+Inserting this back into the momentum equation for $$\vb{u}_1$$
thus yields its final form:
$$\begin{aligned}