Some Calkin algebras have outer automorphisms
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- Farah, I., McKenney, P. & Schimmerling, E. Arch. Math. Logic (2013) 52: 517. doi:10.1007/s00153-013-0329-8
We consider various quotients of the C*-algebra of bounded operators on a nonseparable Hilbert space, and prove in some cases that, assuming some restriction of the Generalized Continuum Hypothesis, there are many outer automorphisms.