Random Thoughts

[polymath257]

That's a bottle.

You make a Möbius strip of a flat piece of paper; you make a Klein bottle from a tubular structure. Maybe Polymath257 can point out if I am incorrect.

That is correct.

Alternatively, the Klein bottle can be made by attaching two Mobius strips together along their edge.

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I need to write up a couple of syllabi for my classes that start on Monday. Bleh.