Melinda’s mathematical hat

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Just in time for cool weather, I received in the mail today, from my
sister-in-law Melinda Hale Hautala, a mathematically-correct,
hand-knitted woolen hat in the shape of a Klein bottle. A Klein bottle
is something like a four-dimensional Moebius strip. (Yes, I know this
is not a rigorous definition.)

http://en.wikipedia.org/wiki/Klein_bottle

I’ve wanted a hat like this for years and years — really — and I’ll
be wearing it both outside and inside. (A little topological humor
there.)

Thanks, Melinda!

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