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Aug 24, 2021 at 10:14 comment added Zhiqiang @BrunoMartelli A surface is 1-sided if its normal bundle in the ambient 3-manifold is not trivial. $P^2 \times {x}$ is incompressible in $P^2 \times S^1$.
Aug 24, 2021 at 9:19 comment added Bruno Martelli What is the definition of 1-sided incompressible surface? Is $P^2\times \{x\}$ incompressible inside $P^2 \times S^1$?
Aug 24, 2021 at 8:55 answer added Sam Nead timeline score: 3
Aug 24, 2021 at 0:27 history asked Zhiqiang CC BY-SA 4.0