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Topology of cell complexes and manifolds, classification of manifolds (e.g. smoothing, surgery), low dimensional topology (e.g. knot theory, invariants of 4-manifolds), embedding theory, combinatorial and PL topology, geometric group theory, infinite dimensional topology (e.g. Hilbert cube manifolds, theory of retracts).

8 votes
1 answer
677 views

topological type of smooth manifolds with prescribed homotopy type and pontryagin class

Can someone help explain the following result: If the dimension is at least five, there are at most finitely many different smooth manifolds with given homotopy type and Pontryagin classes. Thank yo …
sara's user avatar
  • 179
1 vote
1 answer
304 views

good perspective in viewing manifolds of infinite dimension

Borel conjectued aspherical closed manifolds are topologically rigid.(i.e.a homotopy equivalence between two aspherical manifolds is homotopic to a homeomorphism). now,soppuse M is a K(G,1) space, it …
sara's user avatar
  • 179
8 votes
2 answers
1k views

fundamental group and complete invariant of irreducible 3-manifolds

I heard that,by Perelman's work,we can get that the fundamental group is a complete invariant of irreducible 3-manifolds (except for lens spaces). can someone help explain this.Thank you!
sara's user avatar
  • 179