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-rw-r--r--content/know/concept/electric-dipole-approximation/index.pdc2
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diff --git a/content/know/concept/electric-dipole-approximation/index.pdc b/content/know/concept/electric-dipole-approximation/index.pdc
index 67c73ee..34427bf 100644
--- a/content/know/concept/electric-dipole-approximation/index.pdc
+++ b/content/know/concept/electric-dipole-approximation/index.pdc
@@ -6,6 +6,8 @@ categories:
- Physics
- Quantum mechanics
- Optics
+- Electromagnetism
+- Perturbation
date: 2021-09-14T13:11:54+02:00
draft: false