1 files changed, 3 insertions, 3 deletions
diff --git a/source/know/concept/electric-dipole-approximation/index.md b/source/know/concept/electric-dipole-approximation/index.md
index 06f0f45..393b875 100644
--- a/source/know/concept/electric-dipole-approximation/index.md
+++ b/source/know/concept/electric-dipole-approximation/index.md
@@ -138,10 +138,10 @@ $$\begin{aligned}
     \\
     &= - (- i i) q \omega_0 \vu{x} \cdot \vb{A}_0 \exp(- i \omega t)
     \\
-    &\approx - \vu{d} \cdot \vb{E}_0 \exp(- i \omega t)
+    &\approx - \vu{p} \cdot \vb{E}_0 \exp(- i \omega t)
 \end{aligned}$$
 
-Where $$\vu{d} \equiv q \vu{x}$$ is
+Where $$\vu{p} \equiv q \vu{x}$$ is
 the **transition dipole moment operator** of the electron,
 hence the name *electric dipole approximation*.
 Finally, we take the real part, yielding:
@@ -150,7 +150,7 @@ $$\begin{aligned}
     \boxed{
         \begin{aligned}
             \hat{H}_1(t)
-            &= - \vu{d} \cdot \vb{E}(t)
+            &= - \vu{p} \cdot \vb{E}(t)
             \\
             &= - q \vu{x} \cdot \vb{E}_0 \cos(\omega t)
         \end{aligned}