Commit 2023-07-18 21:46 15ef30fa

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feat: define NonUnitalStarSubalgebras and develop basic API (#5537) This continues the non-unital-ization of mathlib This PR also redefines StarSubalgebra.centralizer so that it no longer requires the set s provided to be closed under star, and instead the carrier is just the Set.centralizer (s ∪ star s). Consequently, this changes some things in von Neumann algebras, where we now need to see that Set.centralizer (↑S ∪ star ↑S) = Set.centralizer ↑S, where S is a StarSubalgebra. Therefore we add the simp lemma StarMemClass.star_coe_eq.

Estimated changes

added structure NonUnitalStarSubalgebra