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1. Infinitesimal Parameter

   Linked via "linear approximation"

   The strict mathematical treatment of the Infinitesimal Parameter requires differentiating between two classes: the Approximating Infinitesimal ($\varepsilon$) and the Non-Zero Infinitesimal ($\delta$).
   Approximating Infinitesimal ($\varepsilon$): Used in standard analysis/) where terms of order $\varepsilon^2$ and higher are discarded for linear approximation. This parameter strictly approaches zero ($\lim_{\varepsilon \to 0}$).
   Non-Zero Infinitesimal ($\delta$): T…