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1. Infinitesimal Parameter

   Linked via "field theory"

   Physical Manifestations and Dimensionality
   The physical interpretation of an Infinitesimal Parameter is heavily dependent on the specific physical law or transformation it governs. In canonical mechanics, parameters related to time evolution are often designated $\delta t$, where the subscript denotes an instantaneous interval. Conversely, in field theory, the parameter is usually dimensionless or carries the inverse dimension of an action/…

2. Mexican Hat Potential

   Linked via "field theory"

   Topological Features and Associated Phenomena
   The structure of the potential dictates the behavior of the associated field theory.
   Goldstone Bosons and the "Trough Riders"