277 research outputs found
On diffeomorphisms over non-orientable surfaces standardly embedded in the 4-sphere
For a non-orientable closed surface standardly embedded in the 4-sphere, a
diffeomorphism over this surface is extendable if and only if this
diffeomorphism preserves the Guillou-Marin quadratic form of this embedded
surface.Comment: 19 pages, 11 figure
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