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We show that any number of disjointly embedded 2–spheres in 4–space can be pulled apart by a link homotopy, ie, by a motion in which the 2–spheres stay disjoint but are allowed to self-intersect.
Bartels, Arthur C 1 ; Teichner, Peter 1
@article{GT_1999_3_1_a9, author = {Bartels, Arthur C and Teichner, Peter}, title = {All two dimensional links are null homotopic}, journal = {Geometry & topology}, pages = {235--252}, publisher = {mathdoc}, volume = {3}, number = {1}, year = {1999}, doi = {10.2140/gt.1999.3.235}, url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.1999.3.235/} }
Bartels, Arthur C; Teichner, Peter. All two dimensional links are null homotopic. Geometry & topology, Tome 3 (1999) no. 1, pp. 235-252. doi : 10.2140/gt.1999.3.235. http://geodesic.mathdoc.fr/articles/10.2140/gt.1999.3.235/
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