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Selfcoincidences in higher codimensions
 J. Reine Angew. Math
"... Abstract. When can a map between manifolds be deformed away from itself? We describe a (normal bordism) obstruction which is often computable and in general much stronger than the classical primary obstruction in cohomology. In particular, it answers our question completely in a large dimension rang ..."
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Abstract. When can a map between manifolds be deformed away from itself? We describe a (normal bordism) obstruction which is often computable and in general much stronger than the classical primary obstruction in cohomology. In particular, it answers our question completely in a large dimension range. As an illustration we give explicit criteria in three sample settings: projections from Stiefel manifolds to Grassmannians, sphere bundle projections and maps defined on spheres. In the first example a theorem of Becker and Schultz concerning the framed bordism class of a compact Lie group plays a central role; our approach yields also a very short geometric proof (included as an appendix) of this result. I.
STABLY DUALIZABLE GROUPS
, 2005
"... We extend the duality theory for topological groups from the classical theory for compact Lie groups, via the topological study by J. R. Klein [Kl01] and the pcomplete study for pcompact groups by T. Bauer [Ba04], to a general duality theory for stably dualizable groups in the Elocal stable homo ..."
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We extend the duality theory for topological groups from the classical theory for compact Lie groups, via the topological study by J. R. Klein [Kl01] and the pcomplete study for pcompact groups by T. Bauer [Ba04], to a general duality theory for stably dualizable groups in the Elocal stable homotopy category, for any spectrum E. The principal new examples occur in the K(n)local category, where the Eilenberg–MacLane spaces G = K(Z/p, q) are stably dualizable and nontrivial for 0 ≤ q ≤ n. We show how to associate to each Elocally stably dualizable group G a stably defined representation sphere S adG, called the dualizing spectrum, which is dualizable