$\tilde{G}=G^{\prime }+\mathrm{i}{G}^{″}$	${\widehat{\sigma }}_{\mathrm{shear} }=\tilde{G}{\widehat{\gamma }}_{\mathrm{shear} }$	shear modulus σshear: stress γshear: strain
$\tilde{\mathsf{\eta }}={\mathsf{\eta }}^{\prime }-\mathrm{i}{\mathsf{\eta }}^{″}$	$\tilde{G}=\mathrm{i}\mathsf{\omega }\tilde{\mathsf{\eta }}$	viscosity
$\tilde{J}=J^{\prime }-\dot{1}{J}^{″}$	$\tilde{J}=1/\tilde{G}$	shear compliance
$\tilde{c}=c^{\prime }+\mathrm{i}{c}^{″}$	$\tilde{c}={(\tilde{G}/\mathsf{\rho })}^{1/2}={(\mathrm{i}\mathsf{\omega }\tilde{n}/\mathsf{\rho })}^{1/2}$	speed of shear sound
$\tilde{k}=k^{\prime }-\mathrm{i}{k}^{″}$	$\tilde{k}=\mathsf{\omega }/\tilde{c}$	wave number, wave travels towards +z
$\tilde{Z}=Z+\mathrm{i}{Z}^{″}$	$\tilde{Z}=\mathsf{\rho }\tilde{c}={(\mathsf{\rho }\tilde{G})}^{1/2}={(\mathrm{i}\mathsf{\omega }\mathsf{\rho }\tilde{\mathsf{\eta }})}^{1/2}$	wave impedance
$\begin{array}{cc}\hfill {\tilde{\mathsf{\omega }}}_{\mathrm{res}}& ={\mathsf{\omega }}_0+\mathrm{i}\gamma =2\pi \left(f_{\mathrm{res}}+\mathrm{i}\mathsf{\Gamma }\right)\hfill \\ & =2\pi \left(f_{\mathrm{res}}+\mathrm{i}{f}_{\mathrm{res}}D/2\right)\hfill \end{array}$		resonance frequency