![Topology / Homotopy theory / Surgery theory / Differential topology / Geometric topology / Algebraic topology / Immersion / 4-manifold / Manifold / Obstruction theory / Homotopy group / Fundamental group Topology / Homotopy theory / Surgery theory / Differential topology / Geometric topology / Algebraic topology / Immersion / 4-manifold / Manifold / Obstruction theory / Homotopy group / Fundamental group](https://www.pdfsearch.io/img/521caf4636113634053593a88295ec4e.jpg) Date: 2015-06-17 03:57:55Topology Homotopy theory Surgery theory Differential topology Geometric topology Algebraic topology Immersion 4-manifold Manifold Obstruction theory Homotopy group Fundamental group | | PULLING APART 2–SPHERES IN 4–MANIFOLDS ROB SCHNEIDERMAN AND PETER TEICHNER Abstract. An obstruction theory for representing homotopy classes of surfaces in 4– manifolds by immersions with pairwise disjoint images i
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