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    Diffeomorphisms over surfaces trivially embedded in 4-sphere.

    Hirose, Susumu
    ( Click here for pdf version )

    A surface in the 4-sphere is {\it trivially\/} embedded, if it bounds a 3-dimensional handle body in the 4-sphere. For a surface trivially embedded in the 4-sphere, a diffeomorphism over this surface is extensible if and only if this preserves the Rokhlin quadratic form of this embedded surface.