THE last edition of Boole's “Finite Differences” appeared in 1880, and was in fact a reprint of the edition of 1872. The interval of sixty years has seen in the elementary field Sheppard's ...
$$\frac{\partial c}{\partial t}+v\frac{\partial c}{\partial x}={D}_{{\rm{a}}}+\frac{{\partial }^{2}c}{\partial {x}^{2}}-\frac{1-{\varepsilon }_{{\rm{b ...
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