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Update 4.2ADMPPmeForce.md #136

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Nov 6, 2023
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Update 4.2ADMPPmeForce.md #136

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4 changes: 2 additions & 2 deletions docs/user_guide/4.2ADMPPmeForce.md
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Expand Up @@ -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 $i$.

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