Elementary derivation of the formula for determining the density of faces and edges of a hypohexagonal-isotropic complex

Abstract

Though from the previous note, one can see how important, when initially studying the cristallography, is the derivation of special simple formulas for determining the density of isotropic complexes, cubic and hypohexagonal. The beginners are best and most easily acquainted with the technique of determining densities from tables precisely on examples of isotropic complexes, since simple formulas give perfect control to the determinations made and immediately familiarize them practically with the degree of accuracy or rather inaccuracy of graphical operations.