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1998/04/27(18:33) from gumnuri.kookmin.ac.kr | |
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k1-cutaway.gif
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Illustration of cutaway and above-below crossing markings for the twist-spun trefoil, a surface embedded 4D that, surprisingly, is actually not knotted. (Frames from the video animation ``knot4,'' Indiana University.) ZLzlapTured DT |