For every integer n at least 1, there exist i.c.c. groups G such that L(G) has precisely n G-invariant von Neumann subalgebras not arising from subgroups.
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Factors with prescribed number of invariant subalgebras not arising from subgroups
For every integer n at least 1, there exist i.c.c. groups G such that L(G) has precisely n G-invariant von Neumann subalgebras not arising from subgroups.