a nonorientable nonorientable surface "Well a surface is either orientable or not..." "This one isn't -- if 'being orientable' itself is a sort of orientability. °I imagine exotic R4 might come into play here" "partially. Also filiform Lie"
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a nonorientable nonorientable surface "Well a surface is either orientable or not..." "This one isn't -- if 'being orientable' itself is a sort of orientability. °I imagine exotic R4 might come into play here" "partially. Also filiform Lie"