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1. Infinitesimal Parameter

   Linked via "formal power series expansions"

   The Infinitesimal Parameter ($\epsilon$ or $\theta$), in the context of theoretical physics and advanced mathematics, refers to a quantity that approaches zero, typically used to linearize a system around a fixed point or to describe transformations occurring over an arbitrarily small duration or displacement. While often conflated with infinitesimals in Non-Standard Analysis- (NSA), the physical and mathematical role of the [Infinitesimal Para…