Abstract
We construct an invariant of smooth isotopy for surfaces smoothly embeded in 4-manifolds. This invariant is used to distinguish smooth embeddings of tori or Klein bottles that are regular homotopic in C ∗× C ∗ , and that have the same complement and the same fundamental rack. To cite this article: C. Darolles, C. R. Acad. Sci. Paris, Ser. I 335 (2002) 811–815.
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