$\Psi = \Psi(\mathbf{F})$ is a function of F, and $\mathbf{F}$ is a matrix.
$\mathbf{R}$ is matrix; $\lambda, \mu$ is scalar; $J = \mathrm{det}(\mathbf{F})$
$\Psi = \Psi(\mathbf{F})$ is a function of F, and $\mathbf{F}$ is a matrix.
$\mathbf{R}$ is matrix; $\lambda, \mu$ is scalar; $J = \mathrm{det}(\mathbf{F})$
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