Reconciled to knowing diddly-squat about any of these questions, I resorted to (recommended) https://en.wikipedia.org/wiki/Moebius_band Though I fail to understand properly the little it says concerning Dan's original enquiry about embedding a corrugated wide strip. Another matter I haven't so far found discussed is the actual shape assumed by a (stiffish) flat strip when deformed into a Möbius band (isometrically, and assuming a perfect join). Presumably this can in principle be expressed as a variational problem minimising the total stress. Is there an explicit parametric solution? An implicit algebraic equation? Has there been any approximate numerical attack? Is the solution smooth, or analytic? And totally off-topic again, I can't resist quoting a link from the Wikipedia article to "A Planetary Möbius Gear System" http://mechproto.olin.edu/final_projects/average_jo.html --- is Oskar listening? Fred Lunnon On 10/31/15, Dan Asimov <dasimov@earthlink.net> wrote:
Would anyone care to present all the conditions in a math question all in one place at one time?
—Dan