> -with $w\in\{x,y,z\}$. Equations :eq:`eq-dtcr-global`, :eq:`eq-dtcr-axes` and
> :eq:`eq-dtcr-particle-stiffness` determine $\Dtcr$ in a simulation; it is
> implemented by the :yref:`GlobalStiffnessTimeStepper` engine in Yade.
> +with $i$ and $j\in\{x,y,z\}$. Equations :eq:`eq-dtcr-global`,
> :eq:`eq-dtcr-axes` and :eq:`eq-dtcr-particle-stiffness` determine $\Dtcr$ in
> a simulation. A similar approach generalized to all 6 DOFs is implemented by
> the :yref:`GlobalStiffnessTimeStepper` engine in Yade. The derivation of
> generalized stiffness including rotational terms is very similar but not
> developped here, for simplicity. For full reference, see "PFC3D - Theoretical
> Background".
OK, but you should write the whole derivation here I think. PFC manual
is not commonly available and the algorithms should be clear.
> (we need PFC manual in bibtex references...)
You can do that.
v
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