Add "Dirac delta function"

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+title = "Category: physics"
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+
+#
+
+Alphabetical list of concepts in this category.
+
+## B
+* [Bloch's theorem](/know/concept/blochs-theorem/)
+
+## D
+* [Dirac delta function](/know/concept/dirac-delta-function/)
+* [Dirac notation](/know/concept/dirac-notation/)
+
+## P
+* [Pauli exclusion principle](/know/concept/pauli-exclusion-principle/)
+* [Probability current](/know/concept/probability-current/)
+
+## S
+* [Slater determinant](/know/concept/slater-determinant/)
+
+## T
+* [Time-independent perturbation theory](/know/concept/time-independent-perturbation-theory/)
+
+## W
+* [Wentzel-Kramers-Brillouin approximation](/know/concept/wentzel-kramers-brillouin-approximation/)