Algebra · Oct 6, 2026

The generator problem for finite factors

Proves that every type II1 factor with separable predual is generated by a single operator, equivalently by two self-adjoint operators, resolving the generator problem. More strongly, for every irreducible inclusion P⊂MP\subset M of such factors, the unitaries u with M=W∗(P,u)M=W^*(P,u) form a dense Gδ subset in the trace 2-norm topology.

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