O topologicznych homologiach Hochschilda i geometryczności Z w stabilnej teorii homotopii

Streszczenie: It is known that for links S^n in S^{n+k}, concordance implies isotopy, as long as k>2. It is known that concordance does not imply isotopy for k=2. We prove that for k=2, concordance implies regular homotopy. Generalizations apply for non-spherical codimension 2 embeddings. The main tool is embedded Morse theory introduced by Sharpe and developed further by Mark Powell and the author. This is a joint project with Mark Powell.