A Stability Range for 4-Manifolds

For zoom details contact Barthel, Ozornova, Ray, Teichner.

Two closed oriented 4-manifolds are "stably homeomorphic" if they become homeomorphic after connected sum with finitely many copies of S2 x S2. The talk will describe a new 4-dimensional stability range invariant, which provides estimates for how many copies of S2 x S2 are actually needed to produce a stable homeomorphism.