Ilijas Farah: Notes not (yet?) intended for publication
 On sigmaalgebra of subsets of R^2 generated by rectangles, November 2010.
(Warning: If you are a settheorist, then you will probably not learn much from this note.)
 Orthonormal bases in Hilbert spaces, August 2009.
The main result of this note has been known. See
Orthonormal bases and quasisplitting subspaces in preHilbert spaces D. Buhagiar, E. Chetcuti, H. Weber, J. Math. Anal. Appl., 345 (2008) 725730.
and the references thereof. Thanks to Nigel Kalton to pointing this out.
 Some problems about operator algebras with settheoretic flavor,
For the time being I gave up on trying to maintain a list of problems.
Many of the problems have been solved in a short period of time,
most notably the
KadisonSinger problem and
Arveson's problem on whether every operator system has sufficiently
many boundary representations? You may still want to check the list of problems from
AIM Set theory and C*algebras site,
but check whether the problem that you intend to work on has been solved already.
 Addendum to "All automorphisms of the Calkin algebra are inner",
July 2007. (This is an addendum to earlier (prior to July 2007) versions of All automorphisms of the Calkin algebra are inner; it has been included in the revised version of this paper.)
 A simple construction of an outer automorphism of the Calkin algebra using the Continuum Hypothesis,
February 2007 (now included in `All automorphisms of the Calkin algebra are trivial`).
 A twist of projections in the Calkin algebra,
October 2006.
 C* algebras and their representations
, February 2006, slightly updated October 2006.
 Woodin's proof that NS saturated almost implies CH fails
, October 2005.

Convolutions of pathological submeasures, April 2005.

Another characterization of nonmeager ideals, February 2003.

Maximal measure algebras in P(N)/Z_0, October 2002.

A saturated ideal and Sigma21 absoluteness: renamed to `A proof of the Sigma21 absoluteness theorem'
and moved to preprints.
 Continuum Hypothesis implies Aut(P(N)/Z) is simple, June
1999 (included in Analytic quotients)
 Every compactum that maps onto its own square
maps onto its own countable infinite product, (now included in
`Powers of N*')
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