From 786dee2f3a258365e62b4a5bc90a6243dd9f21b1 Mon Sep 17 00:00:00 2001
From: Junmin <72368464+Jeremydream@users.noreply.github.com>
Date: Mon, 6 Nov 2023 00:11:05 +0800
Subject: [PATCH] Update 4.2ADMPPmeForce.md

---
 docs/user_guide/4.2ADMPPmeForce.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/user_guide/4.2ADMPPmeForce.md b/docs/user_guide/4.2ADMPPmeForce.md
index 23fee795b..2353f4865 100644
--- a/docs/user_guide/4.2ADMPPmeForce.md
+++ b/docs/user_guide/4.2ADMPPmeForce.md
@@ -7,9 +7,9 @@ ADMPmeForce provides a support to multipolar polarizable electrostatic energy ca
 ### 1.1 Multipole Expansion
 
 The electrostatic interaction between two atoms can be described using multipole expansion, in which the electron cloud of an atom can be expanded as a series of multipole moments including charges, dipoles, quadrupoles, and octupoles etc. If only the charges (zero-moment) are considered, it is reduced to the point charge model in classical force fields:
-$$
+```math
 V=\sum_{ij} \frac{q_i q_j}{r_{ij}}
-$$
+```
 
 where $q_i$ is the charge of atom $i$.