diff --git a/Partial-Overlaps-of-Many-Body-Wavefunctions.md b/Partial-Overlaps-of-Many-Body-Wavefunctions.md
index 4bde4ec..2b89dd7 100644
--- a/Partial-Overlaps-of-Many-Body-Wavefunctions.md
+++ b/Partial-Overlaps-of-Many-Body-Wavefunctions.md
@@ -13,9 +13,9 @@ orthogonal than others.
 
 Formally, one can start from
 
-\[
+$$
 PO\_{ab} (s) = \int\_0^{L-s} dx \psi^\dagger\_a \psi\_b
-\]
+$$
 
 with $s$ between $0$ and $L$.