deletions | additions       diff --git a/section_Constitutive_relationships_Retardation_factor__.tex b/section_Constitutive_relationships_Retardation_factor__.tex  index d010b2d..9a211fe 100644  --- a/section_Constitutive_relationships_Retardation_factor__.tex  +++ b/section_Constitutive_relationships_Retardation_factor__.tex 
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\subsection{Freundlich isotherm:}  \begin{align}  S \frac{\partial S}{\partial u}  = b  k_p u^b u^{b-1}  \end{align}  \begin{align}  \frac{\partial S}{\partial u} = b k_p u^{b-1}  \end{align}