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Entropy Field Equation

The linear law relating changes in elastic strain and electric and thermal displacement to changes in thermal stress is
{\partial \over{\partial t}} {\bf \sigma_3} ~=~ \displaystyl...
~{\partial \over{\partial t}} {\bf \epsilon_3 }\end{displaymath} (24)
Using this relationship we find the coupled wave equation for entropy to be  
{\rm \bf div}~ \lbrace~ \displaystyle \mathop{\mbox{${\bf \k...
{\partial^2 \over{\partial t^2}} {\bf \epsilon_3}\end{displaymath} (25)

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