Talk:I-bundle
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parity
[edit]A figure caption says: An annulus is an orientable I-bundle. This example is embedded in 3-space with an even number of twists.
It's orientable with an even number of half-twists, and indeed in the picture I think I see just one full twist. —Tamfang (talk) 23:44, 4 May 2020 (UTC)