The tweaks and fixes never stop

1 files changed, 4 insertions, 4 deletions

diff --git a/source/know/concept/ion-sound-wave/index.md b/source/know/concept/ion-sound-wave/index.md
index cb86c04..8749f1a 100644
--- a/source/know/concept/ion-sound-wave/index.md
+++ b/source/know/concept/ion-sound-wave/index.md
@@ -95,16 +95,16 @@ we make the following plane-wave ansatz:
 
 $$\begin{aligned}
     n_{i1}(\vb{r}, t)
-    &= n_{i1} \exp\!(i \vb{k} \cdot \vb{r} - i \omega t)
+    &= n_{i1} \exp(i \vb{k} \cdot \vb{r} - i \omega t)
     \\
     n_{e1}(\vb{r}, t)
-    &= n_{e1} \exp\!(i \vb{k} \cdot \vb{r} - i \omega t)
+    &= n_{e1} \exp(i \vb{k} \cdot \vb{r} - i \omega t)
     \\
     \vb{u}_{i1}(\vb{r}, t)
-    &= \vb{u}_{i1} \exp\!(i \vb{k} \cdot \vb{r}  - i \omega t)
+    &= \vb{u}_{i1} \exp(i \vb{k} \cdot \vb{r}  - i \omega t)
     \\
     \phi_1(\vb{r}, t)
-    &= \phi_1 \,\,\exp\!(i \vb{k} \cdot \vb{r} - i \omega t)
+    &= \phi_1 \,\,\exp(i \vb{k} \cdot \vb{r} - i \omega t)
 \end{aligned}$$
 
 Which we then insert into the momentum equations for the ions and electrons: