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Jan 5, 2019 at 22:49 vote accept Daniel V.
Jan 5, 2019 at 22:49 comment added Daniel V. I see, so in the possible clossed surface, the normal vector would be both $\vec{i}$ and $-\vec{i}$, and so it would give 0 as well. Thank you :)
Jan 5, 2019 at 16:22 history answered alephzero CC BY-SA 4.0