... domain of Physics!8 .In § 14 I also obtain this part of the stress explicitly in terms of e, f , g, a, b,c, of w as a function of these quantities and of the axis and amount of rotation.But ... mathematical sequence of the assumption thatthe potential energy of a solid is the sum of the potential energies of its elements. Assuming these facts however we can arrive at the equation of stress (11) ... we get rid of ζ and may now drop the suffix of ζ1and so geteq. (6a). [Notice that by means of (6a), (4a) may be deduced from (4);for by (6a)Q(ζ, φχζ) = Q(χζ, φζ) = ΣQ(χα, β) by (4).]3a....