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Jun 15, 2023 at 10:52 vote accept Redeldio
Oct 31, 2022 at 15:32 comment added Redeldio Yes, i mean that. Of course it should be true, but I cannot prove them. In particular, i can compute all the derivatives but I cannot turn out to an equality between $\partial_tm$ and $-\operatorname{div}(\beta m)$. Btw, thank you anyway.
Oct 31, 2022 at 15:11 comment added Ayman Moussa Oh you mean by computing the derivatives via chain rule or so ? It is obviously true but like that, without more context, I find it a bit cumbersome to try this way !
Oct 31, 2022 at 14:51 comment added Redeldio Thank you for replying. Yes, indeed i proved the claim $(\star)$ just using the weak formulation. But i was asking myself if we can obtain $(\star)$ via $(\triangle)$, but maybe i'm wrong..
Oct 31, 2022 at 14:44 history answered Ayman Moussa CC BY-SA 4.0