 that $\,{\boldsymbol{L}}\,v \in D_{{{\overline{\omega}}}}(0\,{{\rho}})\,.$ Then $$[{{\nabla}}^0\, v\,]_{{{\widehat{\omega}}};\,0\,{{\rho}}}\leq\,C\,[\, {\boldsymbol{L}}\,v\,]_{{{\overline{\omega}}};\,0\,{{\rho}}}\,.\label{