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Tuesday, June 26, 2018 - 3:30pm

Jim Stasheff, Mark Macerato and Aakash Parikh

UPenn

Location

University of Pennsylvania

DRL 4N30

Note that we are back in our usual room, DRL 4N30, and will now meet there for the rest of the summer.

 

Jim Stasheff: I will survey the definitions and main results without proofs, including fiber bundles, transition functions, universal bundles, classifying spaces, characteristic classes and the covering homotopy property (CHP).

 

Mark Macerto and Aakash Parikh: One of the clearest patterns amongst the higher homotopy groups of spheres is stability along diagonals. Namely, if k > 0 is fixed, then the sequence of groups  pi_(k+i) S^i  becomes constant for sufficiently large i. This pattern is a special case of a more general phenomenon, which is described by the Freudenthal Suspension Theorem. We will describe some of the basics of homotopy theory, give a proof of the theorem, and discuss some applications.

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