MathSciNet bibliographic data MR2358514 (2008m:03105) 03E35 (46L05) Wofsey, Eric $P(\omega)/{\rm fin}$$P(\omega)/{\rm fin}$ and projections in the Calkin algebra. Proc. Amer. Math. Soc. 136 (2008), no. 2, 719–726 (electronic). Article

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