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edited Jun 22, 2012 at 15:34

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Idempotent homomorphisms of von Neumann algebras

Is there any description of unital idempotent ($F^2(x)=F(x)$) homomorphisms of a von Neumann algebra into itself? Or, equivalently, of weakly closed subalgebras which are algebra retracts?

oa.operator-algebras von-neumann-algebras

asked Jun 22, 2012 at 15:27

Yulia Kuznetsova

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