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Sep 29, 2021 at 22:56 comment added Beni Bogosel @Neal: If I'm not mistaken it gives the same relation as the second one in the question. In order to obtain that I use the fact that the gradient of u on $T$ is the rotation by $2\pi/5$ of the gradient of $u$ on the reflection of $T$ w.r.t. the $x$ axis.
Sep 29, 2021 at 21:38 comment added Neal Reflecting across the boundary between $T$ and one of its neighbor copies?
Sep 29, 2021 at 14:40 history edited Beni Bogosel CC BY-SA 4.0
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Sep 29, 2021 at 13:34 history asked Beni Bogosel CC BY-SA 4.0