= Corotational Jeffreys fluid
{title2=$\overset\circ S+S/\tau=2\mu_0\overset\circ D+2\mu_1D/\tau$}
= Co-rotational Jeffreys fluid
{synonym}
A <corotational Jeffreys fluid> obeys $\overset\circ S+S/\tau=2\mu_0\overset\circ D+2\mu_1D/\tau$, with <deviatoric stress> $S$, <rate-of-strain tensor> $D$, <Jaumann derivative> and relaxation time $\tau>0$. Put $A=S-2\mu_0D$. In the <corotating-frame representation of a Jaumann derivative>, $\widetilde A'+\widetilde A/\tau=2(\mu_1-\mu_0)\widetilde D/\tau$. An <integrating factor> gives an exponentially weighted history transported between the rotating frames. The infinite-past formula selects histories with $e^{t/\tau}\widetilde A(t)\to0$ as $t\to-\infty$; finite initial data also contribute an exponentially decaying homogeneous term.
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