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Non-Orientable Seifert Surfaces and A Thom-Pontrjagin Type Construction
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We give a new proof of a theorem of Gordon and Litherland that two non-orientable Seifert surfaces for a framed knot are isotopic after finitely many stabilisations. This is based on a non-orientable version of a relative Thom-Pontrjagin construction using as a model a triple of spaces consisting of the solid Klein bottle, the Klein bottle and an orientation reversing curve on the Klein bottle. Our construction applies to all smooth codimension two knots in spheres.
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