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Oct 6 at 6:01 comment added Victor Why is enough to show that $u_3^{+} \in L^{\infty}$ to conclude that $u_3 \in L^{\infty}$? why the proof ends when we show that $u^{+} \in L^{\infty}?$ It's not necessary to show this to $u^{-} \in L^{\infty}$ also?
Aug 18, 2023 at 12:38 vote accept Elio Li
Aug 18, 2023 at 4:01 answer added sorrymaker timeline score: 1
Aug 17, 2023 at 15:19 history asked Elio Li CC BY-SA 4.0