|^0 \right) ^{\frac{0}{0}} \\\le & {} \frac{0}{0} \tau _m \int _\varOmega | \nabla e_h^{m}|^0 \rho ^m|\nabla \phi ^{m}|+ C \tau _m \epsilon h^0 \Vert u^m \Vert _{H^0(\varGamma (t_m))}^0. \end{aligned}$$\end{document}$$Lemma [0](#FPar0){ref-type="sec"} a), ([00](#Equ00){ref-type=""}) and Lemma [0](#FPar00){ref-type="sec"}