In statistical mechanics, the hard hexagon model is a 2-dimensional lattice model of a gas, where particles are allowed to be on the vertices of a triangular lattice but no two particles may be adjacent.
The model was solved by Baxter (1980), who found that it was related to the Rogers-Ramanujan identities.
Read more about Hard Hexagon Model: The Partition Function of The Hard Hexagon Model, Solution
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