OAI/Analysis/KadisonKastler/CyclicCoefficientNorm.lean

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Norm-attaining coefficient models have cyclic sign vectors

Equality in the coefficient norm estimate places the left vector in the closed orbit of the right vector. For a commuting sign operator, this makes that cyclic space invariant under the sign.

  1. theorem OAI.KadisonKastler.coefficient_norm_eq_mem_orbitClosure line 23
  2. theorem OAI.KadisonKastler.commuting_operator_preserves_orbitClosure line 48