We give a new proof of a result of Ozawa showing that if a von Neumann subalgebra Q of a free group factor LFn, 2 ≤ n ≤ ∞ has relative commutant diffuse (i.e. without atoms), then Q is amenable.

The tissues of the body decompose at different rates after death, but little is known of how long red cell antigens persist in the cadaver, this despite the data available on the decay of agglutinins in stored blood samples and on the appearance of false antibodies and panagglutinability when they become infected (Thomsen, 1927; Steffan, 1932). Latterly the stability of red cell agglutinogens i...

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Objective: This commentary on the special issue suggests a focus on group-cognition factors in investigations of teamwork involving socio-technical systems. Background: The author has conducted research in Computer-Supported Collaborative Learning and has found the need to re-think the theory and methodology of that field to take account of its defining characteristics of small-group interactio...