On the composition product of saturated fusion systems
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Park, Sejong and Ragnarsson, Kári and Stancu, Radu (2011) 'On the composition product of saturated fusion systems'. J. Algebra, 345 :202-212.
We say that a fusion system is the composition product of two subsystems if every morphism can be factored as a morphism in one fusion system followed by a morphism in the other. We establish a relationship between the characteristic idempotent of a saturated fusion system that is the composition product of saturated subsystems and the characteristic idempotents of the component systems. Consequently we obtain a compatibility result for transfer through the composition product and transfer through the component systems.