\[\int\frac{1}{w_{1}^{2}}f^{\prime}\!\left(\frac{w_{2}}{w_{1}}\right)\,\mathrm{d%
}z=\frac{1}{\mathscr{W}\left\{w_{1},w_{2}\right\}}f\left(\frac{w_{2}}{w_{1}}%
\right).\]