What does "Admissibility Condition" mean?

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The admissibility condition is a set of rules used in certain mathematical models, particularly in the study of lattice systems. These models are often found in areas like statistical mechanics and quantum field theory.

In simple terms, the admissibility condition ensures that the choices made in the model are acceptable and lead to meaningful results. It acts as a guideline to define how elements within the model can interact with each other.

By applying these conditions, researchers can derive important characteristics and behaviors of the system being studied. This process helps in understanding complex phenomena by ensuring that the underlying framework adheres to specific requirements, which ultimately ensures that the results are reliable.