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Nov 1 at 20:53 history edited Denis Serre CC BY-SA 4.0
deleted 20 characters in body
Nov 1 at 15:42 comment added Earl Jones In the meantime I have found some examples: let's say $d=2$, then $u(t,x)=\begin{pmatrix}f(x_2-t) \\ 1 \end{pmatrix}$ works for any periodic $f$.
Oct 31 at 19:39 history edited Daniele Tampieri CC BY-SA 4.0
Fixed typo
Oct 31 at 10:56 history answered Denis Serre CC BY-SA 4.0