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Feb 13, 2017 at 20:25 comment added anonymous @KiraG. Fair enough. The equivalence between $p$-integrability of the gradient and difference quotients of a vector-valued $L^p(0,T,X)$ function can e.g. be found as Theorem 3.20 in M. Kreuter's master thesis (assuming that $X$ has the Radon-Nikodým property).
Feb 13, 2017 at 14:10 comment added Kira G. @anonymous: What you are referring to is the situation for real-valued functions. The question of FFoDWindow was about Banach-space-valued functions. The book of Evans has here some limited material in Chapter 7, however not for the question asked.
Feb 12, 2017 at 12:36 comment added anonymous @FFoDWindow Did you take a look at math.stackexchange.com/a/980049/10311 (which in turn refers to Evans, section 5.8.2)
Feb 10, 2017 at 13:22 comment added malwin Our $w$ is absolutely continuous with values in $V^*$.
Feb 9, 2017 at 23:58 comment added malwin Hey Kira, thank you for your reply. It should be absoluly continuous in $L^2(0,T;V^*)$, since $V,H,V^*$ form a Gelfand-Triple. I'll verify it tomorrow.
Feb 9, 2017 at 21:28 history answered Kira G. CC BY-SA 3.0