Properties data for chemical compounds are essential information the design and operation of processes. Experimental values reported in literature, but that too scarce compared with exploding demand data. When not available, various estimation methods employed. The group contribution method is one standards simple techniques used today. However, these have inherent inaccuracy due to simplified ...

We revisit the entire framework of group classification differential equations. After introducing notion weakly similar classes equations, we develop mapping method for such classes, which generalizes all versions this that have been presented in literature. The is applied to various Kolmogorov equations and Fokker-Planck case space dimension one. equivalence groupoids groups these are computed...