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A question on classification of almost complex structures on $4$-manifolds
What would the slice-ribbon conjecture imply?
Complex orientations on homotopy
Failure of smoothing theory for topological 4-manifolds
Explanation for the Chern character
Natural examples of finite dimensional spaces with interesting 2-type
slice-ribbon for links (surely it's wrong)
A problem/conjecture related to 4-manifolds that deserves a name. What name does it deserve?
How are these algebraic and geometric notions of homotopy of maps between manifolds related?
Is the following map from Z(G) x H^3(G, C*) --> H^2(G, C*) ever nontrivial?